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Last updated: 31 May 2002 |
Subject: eyepiece comparisons Sent: Friday, May 31, 2002 14:33:45 From: pyrite@clarityconnect.com (Fred & Rose Lieberman) I finally got a chance to take the ETX RA out of the closet this morning. I put it on the table and decided to focus the scope on a tree across the road. Then I began to compare the different lenses to see which worked the best. The lenses are: a.. Meade 4000 26mm Orion KE 25mm (each with Orion Short Tube Barlow 2x) b.. Meade MA 9mm Orion KE 10mm Tele Vue Plossl 11mm Celestron Micro Guide 12.5mm Are you ready for this - The best results were gotten with a.. Orion KE 25mm, Orion KE 10mm, and Celestron Micro Guide 12.5mm The others were so disappointing. Go figure it. Fred
Subject: Graduations on Meade 8-24mm Zoom Sent: Friday, May 31, 2002 11:36:26 From: gokigen_street@hotmail.com (I Nobu) I enjoy your site always. I just got a Meade 8-24mm Zoom Eyepiece yesterday. And I have a question on the accuracy of graduations on the zoom. As you know, there are upper graduations (each mm from 8mm to 24mm) and lower single graduation on the zoom eyepiece. By revolving upper part, we can set a certain length (8mm to 24mm) matched with the lower graduation. As for my Zoom, 8mm graduation does not reach lower graduation while 24mm can perfectly stops at the lower graduation. 8mm graduation stops in midway between 8mm and 9mm (around 8.15mm) and it seems like my eyepiece is 8.15mm - 24mm. Do you think this is a defective piece and I should be better off by asking Meade for an exchange. Sincerely, Nobu
Subject: Where am I Sent: Thursday, May 30, 2002 9:53:02 From: trower@charter.net (Tom & Cheri Lang) Is there a site that I can find out my exacte long. and lat. ? The closest city on my autostar is about 200 miles away. I'm new to all this, but even I dont think that could be to accurate of cords. I was at a site once that I just put my zip code in and it game my my long. and lat. But for the life of me I cant remember where it's at. Your site rocks Thanks TomMike here: See the Astronomy Links page.
Subject: Re: Supercharged ETX Problem Sent: Thursday, May 30, 2002 4:18:53 From: sherrodc@ipa.net (Clay Sherrod) To: Art YES, this does happen frequently and would be a very good thing to remind folks of....however, I can tell you exactly what has happened to cause that "lift and shift" that you are seeing. In addition to the grease seeping out and onto the clutch plate, which will happen, the warmth on the scope base has likely torqued the plastic base onto which the center main axle is fixed. This puts a bind on the scope's movement in AZ and it is very difficult to remedy. Here is the best fix: lock the AZ clamp about halfway until you can feel resistance; once done rotate the AZ all the way both direction to the stops by HAND; once done, clamp just a bit tighter and do the same thing very slowly. Then, hook up the scope and initialize and do the same thing with the clamps firmly tightened via the push buttons in Azimuth several times. This should re-seat the main azimuth bearing and axle. Glad you were able to get the grease removed with success! Thanks for sharing this!! Clay ---------------------------------------- Dr. P. Clay Sherrod sherrodc@ipa.net Arkansas Sky Observatory www.arksky.org ----- Original Message ----- Dear Clay, I had a recent experience with my ETX 90 EC that you supercharged last year that you may want to know about and pass on to your other customers. Over the past few weeks I noticed that my ETX tracking and slewing was getting progressively worse. This past weekend I had the scope out and I was playing with it and I noticed that when slewing left to right (azimuth) the scope tube would lift or down depending on which direction I was slewing. This lift/drop would occur immediately upon changing direction. I also was having trouble with the altitude slewing. I opened the scope up and found grease on the azimuth clutch plate. I knew you had cleaned this very carefully as was at a loss as to how the grease got ther until I remember that I had been using the scope to show some of my friends and family sunspots. My best guess is that the heating of the scope due to my sunspot viewing caused the grease to flow off of both gears and on to the friction clutch surfaces. I had left the scope out but covered for several hours on a warm California afternoon. After I removed the grease from all of these surfaces the scope worked beautifully. You might want to warn your clients about this potential problem. Best Regards, Art
Subject: regarding a sticker.. Sent: Wednesday, May 29, 2002 13:45:53 From: razorcow@hotmail.com (Henrik Ă–lander) I removed the "Do not look into the sun.. etc" sticker that was on top of my ETX-90EC since I didn't think it had any purpose beeing there. When I had removed it i noticed big, ugly "glue-blobs" which were kindof splattered out beneath where the sticker had been. You wouldn't happen to know if this is something they do on all their telescopes? I mean, putting glue under a sticker (makes no real sense)? Or is it just me :). Anyways.. as I get irritated my small details, I mailed MeadeEurope (I'm from sweden) and they said that they didn't have any of the original "do not look into.. blabla" stickers, but they could send me a "tripod-sticker" which is a metallic sticker they put on the Meade tripods. I got it today, and I think it's great that they actually sent me the sticker all the way from germany, but it's pretty big and flashy, so I'm not sure I want to put it there. I've gotten used to the "blobs" now, but I would pretty much like to put an original sticker back there. I have to congratulate you on a great site, btw.. It sure has learned me alot since I bought my 90EC. I'm a newbie at telescopes (and I'm about 18years of age) so your site has really been a good source of information when I really haven't had any people to turn to about any problems or tunings with the telescope. I was supposed to buy some new accessories a while ago, but it looks like I'm going to have to import them directly from germany if I want them soon, because Meade lost their dealer here in sweden, for some reason I know nothing of. Luckily germany also is in EU, so there probably wont be any problems with shipping everything over the borders. Thanks in advance for your help :) Best regards, HenrikMike here: For safety (and legal) reasons, Meade puts that "no Sun viewing" sticker on the telescopes. Removing it is certainly OK (but just don't forget the warning). You can probably remove the glue using a very diluted cleaning solution. Test on a small area to be certain you won't damage the surface. As to a replacement sticker, you could always make a name plate showing your name/address or your Lat/Long or anything you like.
Subject: Recovered from baffle fix{jmerskin}-My experience with similar problem.
Sent: Tuesday, May 28, 2002 15:01:01
From: dcanard@cswnet.com (Douglas+G+Canard++)
I read jmerskins post concerning the scratch in his secondary mirror. I
also had a baffle sag problem,enough to be worrisome,I wanted it to be
centered better.
I called Meade first to see about getting a replacement sticky O-ring
that holds the bafle in place after reading some tech tips on this
website.They told me they dont give out any of those parts any more,and
instead advised going to the hardware store for a suitable substitute.
I also inadverdently ended up with a scratch on my secondary while
dealing with the baffle sagging on my ETX 90 RA.
I instead superglued my secondary baffle back in place after removing
the O-ring which happened back around mid-August last year,it is holding
in place quite well so far,however,I noticed while looking at the sun
soon after this fix that it was kind of washed out looking ,not too bad
really but enough to be noticed compared to previous views when I first
bought my scope.
After removing the miniscus lens and holding it up to a bright light I
could see light coming through the scratch I had made.
I eliminated this excess unwanted light leakage by taking the little
round decal off of the focusing knob of my little Bushnell reflector and
attaching it in place with some mounting putty on front of the miniscus
lens so that it exactly covered the secondary mirror.{and very carefully
too}
The contrast while looking at the sun was much better after trying this
fix. I still get some pretty decent views of the sun ,moon,etc.including
decent CCD imaging at high power{aprox.180X} with a cheap surveillance
camera I had modified for prime focus applications.
I may of decreased the capabilities of my scope Im sure by scratching
the secondary but it still impresses nonetheless.
I called Meade about getting another front lens and secondary mirror and
they told me I would have to get both the lens AND the primary mirror
because they are matched pairs and not sold separately.
Cost for a matched pair was quoted at around $170.It was recommended to
just buy another new or used ETX -90RA since if you look in the right
places you can get one for just a little more than what it costs for
said matched pair.
I agreed.
Hope this helps.
I wish the mishap had never happened but it did.I may have gotten off
lucky.
-doug.
Subject: Messier preferances Sent: Monday, May 27, 2002 21:17:33 From: joerodricks@attbi.com (Joseph Rodricks) Could you point me someplace please? I'm looking for a list of some good Messiers to shoot with my webcam/ETX-90 setup. Should I just start with the brighter ones and work do the dimmer ? Any advice? Thanks. Joe RodricksMike here: Well, you could use the info in my ETX book... Or see the Observational Guides/References page, or the User Observation page, or the SEDS list (linked from the Astronomy Links page).
And:
Well, I ordered your book, hopefully it will arrive in a few days. Amazon.com I'm eager for it. I convinced my parents it was a suitable graduation gift :) The reviews look promising, and knowing what i know about you, I have no doubt it will be wonderfull. Who knows, maybe i'll read it in one sitting. Thanks Mike, for everything you have done! Joe Rodricks (5 days untill graduation)
Subject: Another (soon to be) ETX-90 owner
Sent: Sunday, May 26, 2002 6:52:32
From: pmhart@suffolk.lib.ny.us (Paul Hart)
You have a great web site, in fact I've recommended it in the past. One
thing which surprised me was the constellation tours, they are excellent
as wel as all the other information.
Paul Hart
Subject: Supercharge Kudos Sent: Sunday, May 26, 2002 0:36:32 From: gspencer@suscom.net (Greg Spencer) Just a quick email to let people know the value and worth of Dr. P. Clay Sherrod's ETX Supercharge. Although my scope (ETX-125EC) was not out of warranty, I felt Dr. Sherrod's examination and expertise would allay my concerns over Meade's "quality" problems. Conclusion: the Supercharge is worth every penny. Dr. Sherrod was extremely patient and helpful; from answering questions, scheduling, receipt and repair status, and return. His documentation detailing the checkout and results are excellent. The setup instructions were clear for a beginner (me, still). My Autostar alignment is now on target, and the clear ETX optics are even better than before. Although I have not tried all the new Autostar programming, I'm positive it is the same high quality standard for Dr. Sherrod's work. Again, many thanks to Dr. Sherrod for his Supercharge service. When I purchase my next scope, it will go to Dr. Sherrod immediately. Good viewing, Greg Spencer P.S. -- With apologizes to Dr. Sherrod for being late in sending this email.
Subject: re portable power Sent: Friday, May 24, 2002 9:00:25 From: Quarryeff@aol.com (70 + 125). When I go into the field I use rechargeable NiMH AA's. But I also have a 12Volt rechargeable battery pack (looks like a briefcase) which is normally used to start dead cars. This has a 'cigar' lighter socket at 12V. I ytake this as well if I'm uncertain about the AA's. In the UK these 12V powerpacks sell for about £40 & up; useful thing to have anyway.
Subject: Recovered from baffle fix Sent: Friday, May 24, 2002 6:58:18 From: jmerskin@excite.com The sage of the ETX-90RA continues. I'm the one that used the gel super glue and had problems with the coatings, excess glue, etc. Well, I think I've recovered my scope. The secondary element looks clean, there a just a few fine scratches on the aluminized portion of it, and the baffle is still attached. Since I live in the midwest, I haven't looked through it yet...rain. I don't recommend this to anyone except as a last resort. The stuff that cleaned up everything was the solvent that is used to clean PVC pipe before gluing it up. As soon as I can see some stars, I'll let you know......
Subject: re: power source Sent: Friday, May 24, 2002 0:13:00 From: rseymour@wolfenet.com (Richard Seymour) To: loking01@earthlink.net I use a 500ma Radio Shack supply... for my ETX90. And i consider it -just- adequate. If your ETX125 requires more current than my ETX90, then i, too, would consider 500 ma too small for your scope. Meade originally supplied 1500 ma power units. My Autostar obviously dims and brightens as the motor load changes... which means the lamps are flickering in the encoders, too. And it's the -encoders- which trigger a "Motor Unit Fault" message. (doing a Calibration operation may avoid the MUF's) good luck --dick
Subject: power source Sent: Thursday, May 23, 2002 11:34:44 From: loking01@earthlink.net (loking01@earthlink.net) I had a motor unit fault on my ETX 125. One of the questions the tech asked me was what power source I was using. I told the tech I was using the Radio Shack 500milliamp A/C converter he told me to us nothing less than 1 amp. I don't know about the 90 as to what power source to use but there is an article about using the 500milliamp power source. Brian Great site.
Subject: moon looks backwards? Sent: Tuesday, May 21, 2002 20:25:48 From: ashtonm1@yahoo.com (Mike Ashton) I was looking at the moon today...and the dark side was on the opposite side when I used the telescope...compared to when I use binoculars or normal sight?? That doesn't seem right...I don't think I noticed it before because I just looked at stars and planets...where I wouldn't notice...any ideas? Thanks. MikeMike here: That's normal. I thought it was covered in the manual. I know it is covered in my ETX book.
And:
My bad...I just found out why on another site...I'm really new...sorry to bother you.
Subject: ETX 125 ? Sent: Tuesday, May 21, 2002 17:37:37 From: nitewinds1@hotmail.com (John) As a beginner with and ETX how close should I be able to get to objects after alignment is done? IE in view finder area or more to center of eye piece. I had used it for the first time the other night and was able to get Juipter when it came to it in a lower left corner but when I went to M3 was no where in the eye piece nor could tell it in view finder. Is this normal or did I do something wrong in the trainning the drives ect. ? Thanks for any help you can give me Nightwinds AKA JohnMike here: There are a couple of factors at work here. The accuracy of your Autostar alignment and the accuracy of your finderscope alignment. The more accurate you make both of these the better the results will be.
Subject: Battery Packs Sent: Tuesday, May 21, 2002 16:52:56 From: Wryword@aol.com Dr. Sherrod recommends against using the "C" (or "D"?) batteries in the ETX. Would this advice apply to rechargeable battery packs? I plan on using my scope on the barrier islands here, and it won't be possible to have a car or household electricity available. If these rechargeable battery packs are reliable enough to properly run Autostar, any recommendations as to brand or size?Mike here: There have been many positive reports of battery packs.
Subject: removal of film on Red Dot Finder? Sent: Tuesday, May 21, 2002 14:19:54 From: Michael.Atwell@gecapital.com (Atwell, Michael (CAP, TIP)) I found your website and it is so full of information, I haven't been able to find a remedy I'm looking for. I have a Daisy red dot finder, and I'm trying to find out if the tint of the lens is removable. Is there a place on your site which might help me? Thanks in advance, Mike AtwellMike here: If the tint is due to a coating then yes it would be removable with a strong cleaning solution. But if you remove the tint the red-dot may not reflect properly.
And:
Thanks, Mike, I had not thought of that!
Subject: Telescope question Sent: Tuesday, May 21, 2002 13:13:59 From: jmlaird@puc.edu (JML) I just bought a used telescope and it is missing a piece that looks like it would screw into the bottom of the eyepiece. I might just need a new eyepiece. Here is what I read on the telescope. I am not near it at the moment so I don't have anything off of the eyepiece. If you are willing to help me and need more info, let me know. Brookstone Astronomical Telescope A chronomatic coated lens F=700m D=60mm I'd appreciate any suggestions/advice you can give me. Thank you, JulieMike here: Most 1.25-inch diameter eyepieces have a thread on the inside of the tube opposite where your eye looks into the eyepiece. This is to add a filter. Is this what you mean? If so, filters are optional but sometimes handy.
Subject: I am still using my 6 year old ETX !! Sent: Tuesday, May 21, 2002 8:34:43 From: Doug.Cann@kennington.ca (Doug Cann) I hope all is well with you. It's been a long time and a lot has happened sinced I last wrote to you. Just noticed your name in June's Sky and Telescope. Congratulations on your new book. Did you ever think that that from July 1996, this would come this far. My "old" mechanical ETX is still performing flawlessly and I use it a lot for solar observing with one the 'Solarscreen' mylar filters. Enjoyed the recent gathering of the planets and moon. I guess your are still busy with the site. I am waiting for a cup of coffe to brew and then I am going to look at your site in more detail. As always, keep up the good work Mike.... Cheers.....Doug in sunny BC !!!!Mike here: Little did I know in September 1996 that this Site and my little ETX would be going so strong!
And:
Still a great site. I just read up on the Meade Zoom 4000 eyepiece that I am sort of thinking about for those quick nights out when you don't want to carry a case full of Plossols.. You still have all of the original emails archived from 1996 !! Any of them in your new book ? Maybe I should buy a signed copy ! !!!Mike here: No direct emails in the book but there is some "Q&A" stuff.
Subject: MEADE INSTRUMENTS CORPORATION BETTER MOVE FASTMike here: Competition is always healthy.
TO REMAIN COMPETITIVE AFTER CELESTRON'S LATEST ANNOUNCEMENT !!!!!!! Sent: Tuesday, May 21, 2002 6:39:54 From: JimStout@users.com (Jim Stout) Here is an FYI for you and others on your great web site !!! Are you aware of Celestron's latest product announcement ? They have introduced a very affordable line of next generation NexStar GPS scopes ! The Nexstar 5 i and 8 i now offer an optional GPS plug in accessory for only $199.00 The 5 i price is now $899.00 plus the optional GPS accessory for $199.00 They also have a 40,000 object database standard !!! NO MANUAL ALIGNMENT IS REQUIRED AT ALL. It is fully automatic and compensates for true north and leveling and does an auto alignment for you without any manual input from the user. I hope Meade has a plan to quickly respond to this announcement. Celestron will blow away the ETX sales unless Meade acts quickly to compete with them !!!!!! PLEASE let me know if you have any info on Meade's plans for a GPS accessory that can compete with Celestron. Thanks for a quick response back to me. Jim Stout
Subject: Variable Stars Sent: Sunday, May 19, 2002 6:08:22 From: N.J.Allen@btinternet.com (Nick Allen) I've just put up a brand new site which ought to interest ETX users interested in variables: The Cepheid Distance Scale: A History www.institute-of-brilliant-failures.com/cepheid.htm I'd be very grateful if you could place it in your "general astronomy" links. Kind regards, and best wishes. Nick Allen
Subject: etx90ec
Sent: Saturday, May 18, 2002 16:36:18
From: jstang@bee.net (joel nagle)
i am very new to all this . I purchased a etx90ec and was wondering if
there is a basic video out there some where on the how to get started.
Perhaps one that would go through a set up for viewing a site and also
one showing the use of the 497 autostar.
Thank You,
Joel Nagle
Mike here: Well, there is something on my Site. See Helpful Information --> Tutorials.
Subject: Re: Thank you for all the help... Sent: Saturday, May 18, 2002 16:37:41 From: rseymour@wolfenet.com (Richard Seymour) To: PierreCote@Earthlink.net Pierre Cote wrote: >> I went to see the dealer today and ... now own a Celestron telescope. >> Three problems with Meade was my limit. From a different person's posting on the LX200 group: http://groups.yahoo.com/group/LX200GPS/message/6080 > i have a new 10" lx200gps w/uhtc(replaced my nexstar 11gps that would > not work after sending it back twice.) So the river flows in both directions... I wonder how many owners of each -do- move to "the other camp", and how many others "straddle the fence" by owning -both-? have fun --dick
Subject: Your Book and Polar Home Sent: Saturday, May 18, 2002 7:45:22 From: mlmcd@t-online.de (Carrie Donaldson) My buddy and I tried multiple times to figure out how to home the 105 in polar mode. None of the instructions seemed to be written for the 884 tripod. So I went to my trusted copy of your book, but I can't figure out the following: I set up the face plate facing north. Then set up the scope with the control panel to the west. Then your books says to put the OTA perpendicular to the base facing to the pole postion. This is where I get confussed. If the plate is facing the the pole then the 90' OTA is facing the ground or to the south. What am I doing wrong? Is the "base" the tripod face plate maybe?Mike here: I'm not certain what you mean by placing the "plate" facing north. In Polar Home, the ETX forks are angled above the northern horizon to match your latitude and so point at 90 degrees North Declination (or basically at Polaris). Obviously this requires the tripod head or wedge to be tilted as well. The control panel will still be on the west side.
And:
The plate is the wedge. Is the OTA parallel to the forks in the home position? Do you happen to have a picture of the home position?Mike here: There is an example photo on the April 2001 ETX-125EC Feedback page in the Feedback Archives. Figure 6.19 (bottom) in the Book depicts the same position.
Subject: Re: etx 125; problem child? Sent: Saturday, May 18, 2002 7:33:56 From: kris.vanmol@skynet.be (Kris Van Mol) Hello, it's Kris again, Thank you so much for the link to your techtips page!! I've found the problem! I told you that the OTA still moved in DEC when locked....(it moved even over 10 !!!!!!!) I opened the right arm like disribed in the scopetronix site and saw little pieces of black plastic (!?) under the worm wheel. I checked out the attachement of the wormwheel and what did I found out? Those small pieces of plastic used to be the places where two of the three screws were tapped in!!! So...the wormwheel is only held by 1 screw. I really don't want to send back my ETX once again!! Can't I fix this myself? Greatings, Kris BelgiumAnd:
From: sherrodc@ipa.net (Clay Sherrod) This is easily fixed by merely taking out the existing self-tapping screws and running three 6-32 x 1/2" stainless bolts from the inside of the fork arm, with the threaded end exposed on the disk near the setting circle disk; once threaded through the existing holes (you do not need to drill out the existing holes....merely use a screwdriver and screw them into place) attach the 6-32 nut on the outside plastic plate (the side under the fork arm and tighten very snug but not so tight as to damage the plastic. Best fix in the world and it takes care of a lot of DEC problems. Clay ---------------------------------------- Dr. P. Clay Sherrod sherrodc@ipa.net Arkansas Sky Observatory www.arksky.orgAnd:
After my last E-mail I was finding out how to fix it and indeed, this solution is the best! I think it can help a lot of frustrated ETX users, so put it in your tuning-site. It's a pitty there are a lot of clouds out there now..... Kris
Subject: ETX125: horizontal limit stops got reduced Sent: Saturday, May 18, 2002 5:45:34 From: pacorigel@yahoo.es (Francisco Escrihuela) my name is Paco and I am sending this e-mail from Madrid, Spain. I have been using my Meade ETX125 for some months now with no problems. Last week, when I tried to initiate the procedure for alignment, I realized that the horizontal limit stops had reduced the telescope movement up to 330 instead of the normal range of 630. Indeed, I do not know the cause, so I hope anyone in this site can help me how to solve this thanksMike here: I doubt that it is the fixed hard stops that have caused this. More likely some other obstruction, even a wire (so don't force it or you could cut it). And from our hardware expert:
From: sherrodc@ipa.net (Clay Sherrod) I doubt that the horizontal (azimuth) stops have shifted as they are a fixture of the rotary turntable on which the forks are mounted. More likely is that one of eight screws that hold the fork arm assembly to the turntable has come loose and has lodged within the edge of the rotating azimuth plate, thereby binding the scope as it turns. This is a VERY difficult repair and should not be attempted except by an experienced person, unfortunately for Paco in Spain...perhaps there is a service center nearby at some point in Europe. You cannot gain access to the interior of the turntable without cutting the four DEC wires that go up through the RA clutch and locking bolt from inside the base; this is not something for the weak-hearted and inexperienced. It is incredibly easy to shear off a wire INSIDE the turntable, thereby rendering the DEC axis totally useless. As a emergency fix, you might try this drastic step: 1) unclamp both axes as TAPE the OTA firmly within the two fork arms so that it does not rotate (use soft masking tape or surgical tape that can be easily removed....residue from the tape can be removed with simple denatured alcohol; 2) take the entire telescope and gently turn it upside down while holding firmly in both hands; put a couple of pillows under it for safety; 3) GENTLY shake the telescope in as much a vertical motion as possible; stop periodically and rap firmly the side of the BASE with the heel of your hand while firmly holding in the other hand; 4) shake vertically again; stop and repeat the rapping on the OTHER side of the base. This many times WILL disengage the stuck screw from the turntable perimeter and allow free motion once again. Eventually this screw (since you do NOT want to get in there and remove it!) will again work its way into the gap and perhaps stick the scope. If you can work on it as above immediately and not move the scope in azimuth much at all, it is much easier to dislodge. Like hitting the television set with a hammer to get a better picture, but believe it or not, this does work! Clay ---------------------------------------- Dr. P. Clay Sherrod sherrodc@ipa.net Arkansas Sky Observatory www.arksky.org
Subject: home page ETX picture Sent: Friday, May 17, 2002 22:47:30 From: b.m.dang@worldnet.att.net (bao dang) I own a Meade ETX-EC 90. Like you, I think it's a great scope. I've noticed that the picture of the ETX you have on your home page shows the ETX with a diagonal attached to the back of the telescope tube. If you don't my my asking, I'd just like to know what the purpose of this arrangement is. I've also noticed that the picture shows the diagnonal carrying what looks like a 40mm eyepiece. Again, if you don't mind, I'd like to know if this is a modification which you've made in order to use a focal reducer along with a long focal length eyepiece to achieve very low power and very wide field of view. I understand that the Maksutov design generally doesn't allow very low powers and very wide field. I'm not aware of any focal reducer being made for the ETX. Still, if the arrangement is simply an interesting way to use the ETX within its normal capabilities ( I think that's a Barlow lens attached to the eyepiece), I'd like to know what accessories you've used in order to attach a diagonal to the back-port of the telescope tube. Any answers you give will be greatly appreciated. Thank you. BMD.Mike here: Yes, that is a wide-field adapter (see the Accessory Reviews - Showcase Products page) and a 40mm eyepiece (see "Scopetronix eyepieces" on the Accessory Reviews - Eyepieces page). There is some minor field distortion with this combination but it is acceptable for some purposes.
Subject: Base broke off Sent: Friday, May 17, 2002 21:09:50 From: deleow@prodigy.net.mx (De Leo) I recently discovered this problem with my telescope (ETX 125 EC). Well, it happened in the 'base'...that's where the computer control sticks out. Well, the base is the part of the telescope that protects the whole motherboard inside and the gears and everything. It is held together by 5 small screws to the remaining part of the whole telescope. Those 5 screws are screwed into five plastic holes. Those plastic holes have broken. All of them... and now the base is only held in its place by the two screws that should be used for the table tripod. Is there anyway I can fix this? The loose screws are causing unpleasant noises when the telescope moves left/right, like friction against something. I am afraid I might be overheating the motor this way. Or can I do without the screws? Thanks, Mario De LeoAnd:
From: sherrodc@ipa.net (Clay Sherrod) This problem is almost (not quite!) the same situation as Paco's just discussed! The ONLY way to reattach these screws is to remove the turntable from the base entirely which is NOT a procedure that I recommend....this scope needs to go back to Meade. How in the world did all five (actually there are supposed to be eight) of the screws "break" off? This is the first I have ever heard of the entire set being sheared off. Did it drop? Was the scope rotated while the clamp was tightened? Something had to have broken those screws since there is NO torque whatsoever on them in normal use or even in transporting or setting up the scope! Clay ---------------------------------------- Dr. P. Clay Sherrod sherrodc@ipa.net Arkansas Sky Observatory www.arksky.orgAnd more:
Thanks for the VERY VERY fast answer. I don't know how they broke off. I am extremely careful and never turn the telescope when the clamp is still tightened. Maybe it did break off on transport...it has been on so many trips...and airline baggage management is not great, you know. Returning it to Meade is a big problem. I live in Mexico City. Is that reason enough? Then my next question would be: Would leaving the scope that way (with the broken base) have any further negative impact? Will it do any harm to any hardware piece? Thanks, MarioMike here: Personally I think it should get repaired.
And from Clay:
From: sherrodc@ipa.net (Clay Sherrod) If the scope is carefully taken to and placed on the tripod each time....once fastened to the base the plastic base cover is taken out of the equation as far as your problem....however, it is just a matter of time before the base breaks away entirely and will open the scope up for damage. It sounds like it is time to get it fixed professionally; it WILL work but will only get worse in the process! Good luck! ClayAnd:
Thank you very much for your suggestions. Mario De Leo
Subject: Problems or Moans? Sent: Friday, May 17, 2002 4:22:49 From: marc.delaney@ntlworld.com (marc.delaney) As always I visit your site every two/three days because it is the best ETX resource place I know of, and as always there are enough problems written about the scopes to make you want to hug Celestron! However, except for products that cost the earth, there will be some defective ones slipping through all production lines. Even the space shuttle had a dud one! And I also have a feeling that some new owners may be skipping the instruction manual and also be a bit ham-fisted with their new toy. The point I am making is that reading only problems can dishearten ETX owners whose scopes actually work perfectly. So let us remember that thousands of ETXs do perform as intended and have excellent optics. Also, hearing about supercharging may lead us to think that all ETXs need supercharging, but it is usually best not to fix that which aint broke! But Meade does fall down on the iffy quality of some of its acccessories, so they should take note of that --- Meade, you taken note of what I just said? Mike, thanks again for a super helpful site. Marc (Wales)Mike here: I agree. As I've pointed out many times on the Site, most users only write when they have a problem that they need to solve, whether a real problem with the telescope or operator error. Rarely do people write just to say "everything's fine". And as I've also pointed out many times, not everyone nor every telescope needs "performance enhancing". Yes, you can get more out of almost any telescope by making enhancements, but that is true of cars, operating systems, computers, etc.
Subject: re: Question concerning the use of an external power supply Sent: Thursday, May 16, 2002 20:57:11 From: rseymour@wolfenet.com (Richard Seymour) To: angelos@protasys-net.gr Good external power supplies -can- deliver more power than the set of AA cells inside the scope. That is good. They -do- allow the scope to move faster at MAx speed. That is also good. Meade's Official adapter (the one they sell in the US) supplies 15 (fifteen!) volts to the telescope... much louder, much faster. So your supply providing a -solid- 12 volts is not a problem. have fun --dick
Subject: re: LX90-RA on ETX70 base Sent: Thursday, May 16, 2002 20:51:12 From: rseymour@wolfenet.com (Richard Seymour) To: hugo_de_graaf@hotmail.com that's gotta be a typo.... Anyway: the only real problem with moving the Autostar from scope to scope is that both the Calibration must, and Training should, be re-done each time you move. The Calibration is more critical (you'll get "Motor Unit Faults" if you don't do it), and only takes 5 seconds... but you want to do it -before- aligning, since it messes up the alignment. Training is somewhat an option... if you're happy with performance, don't bother to train with each move of the Autostar. I suspect that the LX90 will yield the smaller training values, so i'd have it be the one you really do.. the ETX70 will simply undeshoot some GoTos by a small amount (possibly not noticed in its wider field of view). I move my Autostar between an ETX90 and an ETX70, and that's how i do it. have fun --dick (wouldn't an LX90 -squash- an ETX70's mount??) (i assume you -really- mean put your ETX90ra's optical tube in the ETX70's mount.)And:
From: hugo_de_graaf@hotmail.com (Hugo de Graaf) I clearly made an typing error: I want to move the ETX90 tube on the ETX70 mount (not the LX90 tube!). Do you know if this is feasable? Hugo de GraafMike here: I don't recall any reports of that, which is why I mentioned the DS mounts articles on the Telescope Tech Tips page.
Subject: Pollen count Sent: Thursday, May 16, 2002 14:20:38 From: dcanard@cswnet.com (Douglas+G+Canard++) What"s the status with the overall pollen count now?.It was pretty bad here in Arkansas a few weeks ago.Even though my car is no longer colored green every morning I"m still curious. Thanks.And:
From: sherrodc@ipa.net (Clay Sherrod) The best source to keep track of this (and it is very interesting to do so!) is www.weather.com and click on the local and national pollen/air quality charts. They are updated twice daily on most days....pollen is decreasing here as it is nationwide presently, but the count this spring nationwide was higher than ever recorded!!
Subject: LX90-RA on ETX70 base Sent: Thursday, May 16, 2002 1:50:12 From: hugo_de_graaf@hotmail.com (Hugo de Graaf) I have an ETX90-RA and an LX90. I would like to upgrade my ETX90-RA to ETX90-EC without buying a new one. If I purchase an ETX70 I would like to: 1-mount the LX90 optics on the ETX70 base, 2-use the Autostar controller of the LX90 both on the LX90 and the ETX70 base with ETX90 optics and 3-use the ETX70 optics as guidescope on my LX90. Can this be done or is there a cheaper/better way to upgrade my ETX90-RA? Regards, Hugo de Graaf the NetherlandsMike here: Obviously the LX90 won't fit on the ETX-70 base. But you can mount the ETX-90 on a DS mount (see the Telescope Tech Tips page). The Autostar can used with either. See the Losmandy web site for mounting rings (http://www.losmandy.com/).
Subject: just Sent: Wednesday, May 15, 2002 13:06:20 From: stevepaint@clearwater.net (Steve Painter) Mike, just found your website & I love it! Thank you for all the valuable information you provide! Best regards, Steve
Subject: Supercharge Sent: Wednesday, May 15, 2002 9:30:05 From: Mimers58@comcast.net (Maryellen Wrobel) What else can I say that has not already been said about Dr. Clay's supercharge.After purchasing a brand spankin' new -90EC last month it took but one observing session for those nasty Meade bugs to creep into my virgin telescope.Who should I call but the "Bugbuster"... Dr. Clay Sherrod.With the hands of a surgeon my 90 was purring like a finely tuned Bently in a 4 day turnaround. I think I have the "new telescope" jinx because I couldn't find a clear night for about five days. After a quick polar alignment and a couple of inputs into the Autostar at one of the dark sky locations near my house on day 5 it was one Messier after another "dead center". M13..BAM, M57..BAM, M44..Bam, M101..BAM. Another fellow observer beckoned me over to have a look through his 10" LX200GPS. WOW !!. Another young fellow had his homemade 13.5" Dob..HOLY %$. Dr.Clay get ready because you might have another patient !!. Are you "Board Certified" on a 20" Obsession because I think I suffering from "Aperture Fever".Getting serious here I just want to thank you so much for your quality work, attention to detail,fast e-mail responses but MOST important it's your love of helping your fellow man !! I have one last thought.As a Quality Control Maintenance Inspector for a "Major" Airline I think its about time for the Meade Quality Control Inspectors to find another line of work...how about passenger screeners at the airport. Sorry for raggin' guys but don't you take any of Dr. Clay's input on what he finds wrong with your scopes??. Take care Doc and I HOPE to see you at Springfield for the ETX party !!! Bob p.s. Sorry I took so long to get this E-mail posted !!!
Subject: Re: ETX problems in the UK Sent: Wednesday, May 15, 2002 5:14:08 From: sherrodc@ipa.net (Clay Sherrod) To: Laurence - For the BEST instructions on the Autostar (the ones that come with it are pathetic) Meade has a non-published complete book-like manual on line at: http://www.meade.com/manuals/autostar/index.html which is a great guide for learning the hand controller...just take your time and it will fall into place....also use the great wealth of info on Mike Weasner's site to help you along. Regarding the test for collimation, you can take a bright star out of focus and look at the image of the secondary (a dark "donut hole") in the center; it should be very close to centered in the slightly out of focus image at very high power. Keep in mind that a Mak has precise in focus collimating and sometimes out of focus is NOT a good judge as to whether it is collimated or not. Another method is to BACK off about 15 feet from the front of the scope and look down the tube; notice all the edges of each component: the main mirror edge, the secondary, the opening going out the back....those should be fairly concentric to one-another; if not, then you might have an alignment problem. Best of luck and keep asking..... Clay ---------------------------------------- Dr. P. Clay Sherrod sherrodc@ipa.net Arkansas Sky Observatory www.arksky.org ----- Original Message ----- > Dear Clay > Thank you for getting back to me so promptly regarding my concerns > about my ETX90EC. When I referred to a sub-standard scope, I was not > meaning the ETX in general (which I know is very highly regarded), I > was referring to my particular one. Hopefully it was a case of > bad-seeing that I experienced. I have downloaded the tips you > pointed me to, and am looking forward to tweaking the drive to > improve its performance. I have not even tried to get my Autostar > working yet as it did not come with any instructions (the joys of > Ebay purchases) although it seems that the ones provided by Meade are > not very useful. It looks like this has caused people a lot of hassle > in the past. It begs the question why Meade don't improve it (and > tighten up their QC on the drives). The tips on Mike Weasner's web > pages will be a big help (his site is clearly a labour of love and is > outstanding). > > I am embarrassed to admit I have little idea how to tell if my scope > is correctly collimated. I could not find details on Mike's pages to > help (although I am sure the info is there somewhere). The only info > I found was about looking down the tube without an eyepiece and > checking that my pupil is centred in the reflection. It doesn't sound > very precise! I found a reference to "star-collimation" but no > details. Is this where you centre a star and then move it out of > focus to see if it shifts off centre? I also saw your warning against > DIY collimation, so I have my fingers crossed that everything is OK! > > Thanks again, you've been a great help. > > LaurenceMike here: There are a couple of collimation articles on the Telescope Tech Tips page.
Subject: Roger Hall's stuck lenscap Sent: Tuesday, May 14, 2002 18:47:58 From: monopertuz@yahoo.com (Fernando Pertuz) I had the exact same problem when the wind knocked over my ETX-RA (the plastic mounting brackets also broke). Brute force was the only solution, however, do it gently! This is what I did. I put a strip of adhesive transfer tape around the black corrector lens holder (where the cap stuck to) then I wrapped the adhesive with a piece of sheet rubber. This gave me a firm grip and avoided either unscrewing the lense or deforming the tube. I then used a kitchen gadget used to remove stuck jar lids and gently, albeit with proper force, removed the darned cap. (The adhesive came off with the strip of rubber) As a substitute for the cap I discovered that the top of a can of M&M candies with added thin cork padding on the inside fit snugly around the lens. So much so that I used another one of these for my ETX-EC as an easy on easy off lens cap! Later, with a little patience and craftmanship, I managed to reshape the threads, but I still use the high technology can top (painted mate black) Saludos, Fernando Pertuz Barranquilla, Colombia
Subject: RE: Re: Thank you for all the help... Sent: Tuesday, May 14, 2002 11:47:15 From: PierreCote@Earthlink.net (Pierre Cote) Again, thank you for all the help. I went to see the dealer today and ... now own a Celestron telescope. Three problems with Meade was my limit. Pierre CoteMike here: Enjoy viewing the sky! That's the important thing.
Subject: Re: essentials Sent: Tuesday, May 14, 2002 5:56:36 From: sherrodc@ipa.net (Clay Sherrod) To: Tim Electric focus is a must in my opinion; get in touch if you get it and let me help you install safely. We should review your eyepieces again....the 20mm is pretty close to what you already have; 4.7mm is way too much power except on very good nights. I would suggest a good Televue 8mm Plossl (about $89 from OPT). The Digi-T digital camera adapter from www.scopetronics.com is the ideal adapter for your camera and a great addition...I will walk you through using it, or Mike Weasner's site: www.weasner.com/etx has many excellent HOW TO's on installing and using this adapter. Here in Arkansas a dew shield is a prerequisite....go for it, but get the MEADE hard shield. Let me know when I can help....glad the Supercharged scope is doing so well! Clay ---------------------------------------- Dr. P. Clay Sherrod sherrodc@ipa.net Arkansas Sky Observatory www.arksky.org ----- Original Message ----- > I have a birthday coming up and my wife is asking for > ideas so I'm looking for "essentials": > > electronic focus > > eyepiece - you mentioned 20mm I think; my autostar > recommends 4.7 UWA on a lot of things > > camera attachment - I have a canon E-70 35mm (I know, > automatic is not the best) and a Olympus D40Z digital > (not sure how i could use this at all) > > dew shield > > Would you consider these essentials or have other > ideas? > > BTW, I saw Merc, Venus, Mars, Saturn, Jupiter all last > night; M106, cat eye neb, and some other things I cant > remember (i need to keep a log). I did screw up > though and erase all tours off the autostar trying to > load sat. info. > > Goto is MUCH MUCH better and now using precision mode > which is awesome. > > Tracking is almost excellent. Still can't quite > center the object and make it stay there but it always > stays in the eyepiece and tracking keeps it there. > > I haven't got a clue what's going on with watching > satellites. Tried to look at DTV5 and Hubble and it > would slew, stop, slew another 90 deg or so az. then > tell me to hit ENTER to track. I never saw a sat. In > fact, first time it ended up pointing to the ground > and trying to go further, had to shut it off suddenly > before it broke itself. > > Still having loads of fun with Celestia....... > Tim
Subject: Question concerning the use of an external power supply Sent: Tuesday, May 14, 2002 1:55:30 From: angelos@protasys-net.gr (Angelos) First things first, a big thanks for the web site, it makes the whole ETX experience much more enjoyable. Quick question (and excuses if this has appeared before). When using an external power supply on an EXT 90EC (12V rated at 1A max - from descriptions found in other relevant mails this seems to be perfectly adequate) everything works fine but the motor hum is of a noticably different pitch (it *sounds* like things are going faster if anything) compared to movement at max rate using the batteries. Does this sound familiar or what ? I did measure the power supply output and it is indeed at 12V. I am a bit concerned that I might be overdriving the motors somehow so any feedback would be appreciated. Regards Angelos VorvolakosMike here: If the "pitch" sounds different, does the scope move faster at a given speed versus when using batteries? It shouldn't.
Subject: 2-inch diagonal and eyepieces on an ETX-90 Sent: Monday, May 13, 2002 18:02:16 From: limulus@pacbell.net (Winthrop T. Jackman) Hi, Is it useful (or even possible) to attach a 2-inch diagonal to the camera port on an ETX-90? Would you get the advantage of brighter images as you do using 2-inch eyepieces in other telescopes? And can the motor drive of the ETX handle the extra weight of some of those bigger 2-inch eyepieces? Thanks in advance for your help. Sincerely, WTJMike here: Well, using the proper SCT adapter (see the Accessory Reviews - Miscellaneous page) it could be done. BUT I would think you would lose a lot of light as the port is so much smaller. And, as with cameras, weight could be a problem.
Subject: Stuck lens cap Sent: Monday, May 13, 2002 8:13:01 From: rlhall19@juno.com I had recently purchased a 90etx and was setting it up last week on my front porch. We live on top of a mountain in NC and the wind is sometimes vicious. It was that kind of a day last Thursday, when my etx & tripod was blown over. It appears that all the electronics are ok, but when I attempted to remove the lens cap to check the optics, it would not come off. As I remember, the cap is removed by turning counter-clockwise. I did get to the point where the cap, attached to the front lens did unscrew, but I still am unable to remove the cap. Do you have any ideas? Thanks Roger L. HallMike here: Do you see any dents along the circumference where the cover screws into the end? It sounds like there might be some deformation. Perhaps only some brute force will remove it; use caution and don't unscrew the lens holder from the tube.
Subject: Re: Baffle Fix Sent: Monday, May 13, 2002 4:58:23 From: jmerskin@excite.com Meade wants me to ship them the scope and $175.00. I can buy a brand new one for $179.00.
Subject: Basic star observation question Sent: Sunday, May 12, 2002 10:02:27 From: brayton@attbi.com (Ted Brayton) Bought my first telescope this week, the ETX-105, primarily for my young son. I didn't have terrific viewing conditions, nor a moon to study, but I did find a few bright stars to look at last night. Every star I choose, looked the same in my telescope, a big white Life Saver, with a dark center. I only have the eye piece that came with the scope, but I can't help but think there is more to it. All the pictures in books and on your web site, are of more interesting things, so I have nothing to compare my findings with. Please tell me what my "picture" of a star should look like, and what additional eye piece I should purchase first. My viewing goals for my first year are to see some decent detailed views of the moon, Jupiter, and Saturn, as well as learning to use Autostar, and finding the more popular constellations. Thank you for any assistance you can lend me, Ted Brayton Middleboro, MAMike here: If you have a clear view of the western horizon, right now you can see Mercury (a small crescent shape right now), Venus (nearly a full disk), Mars, Saturn and its Ring System, and higher up in the sky, Jupiter and up to four of his moons. For the stars, they will appear as small POINTS of light when you have the telescope properly focused. From your description I suspect you have the image way out of focus. Turn the focus knob to make the "big white Life Saver" shrink down to a point.
And:
Thank you for the info and very quick response.
Subject: ETX Field Tripod Sent: Saturday, May 11, 2002 22:40:54 From: talaurin@aol.com I have had an ETX-90EC for 2 1/2 years now and have actually used it very little. I found aligning it to be frustrating. I have just found your website and hope that I can find answers to my alignment problems. But my question about the field tripod is concerning the flimsy tray and arms that attach to the 3 tripod legs. I have never seen anything so cheaply made in my life. Invaribly the arms come off the tray when I try and spread the legs out. Hope you can help me. Thank you Ted LaurinMike here: I've not had a problem with the tray coming loose on my #883 Field Tripod. Is that the one you have? Can you describe the setup in more detail?
And:
I have the #883 Deluxe Field Tripod. When you initially spread the tripod legs, you have these 3 aluminum pieces, that Meade calls the extension strut system, that hang from the inside of each leg. At the end of each piece is a hook, bent in the aluminum, that hooks into slots in the aluminum center piece, that Meade calls the central hub. The black metal tray that holds eyepieces, etc., fits on this centerpiece, with a knob nut screwed onto a single bolt which goes through a hole in the center of the centerpiece. As you spread the legs, the whole assembly should unfold out. However the aluminum is so weak and thin that the hooks bent and come off the centerpiece. Once you get it all spread out and the tray in place, the tripod is pretty rigid. But getting it spread out or folded back up again is almost impossible without the aluminum pieces coming unhooked from the centerpiece. Hope this all makes sense. I bought the telescope and tripod in early 2000. Maybe it's been improved by now. Did I read on your website that Meade had come out with inserts for the tripod legs that beef them up so you don't have the chance of denting the legs when you tighten the height adjustment knobs? Again, thanks for your interest in my problem. Is the book that you wrote available at major bookstores?Mike here: Now I understand. It is certainly possible to bend the metal that is used and therefore cause all manner of problems. I've not bent anything on mine so haven't experienced this problem. I suppose you could get some wire or something and make it so that the pieces don't become disconnected. Yes, there are leg inserts available from Meade. And yes, there are a couple of newer model tripods, the #884 and the #887. The inserts and the new tripods are discussed on the Accessory Reviews - Tripods page. And thanks for the interest in the book. I've not yet seen it in the local bookstores but got a report that Barnes and Noble has it at their web site.
Subject: Arc measurement Sent: Saturday, May 11, 2002 19:33:10 From: Esacameron@aol.com Your site is the only place I could think of to ask this question. I trust it isn't to far afield: What is the equation that describes the number of degrees you see when looking thru a straw to sight Polaris for polar aligning a barn door tracker. I can't think of a specific enough search term on Google. Thank you.....Steve CameronMike here: Got me. I suppose it depends on the length and width of the straw. Simple trig, I'd think!
Subject: Appreciation for Dr Sherrod's SuperCharge Service
Sent: Saturday, May 11, 2002 11:17:04
From: jroloff@earthlink.net (James S Roloff)
I wanted to submit a note of support and appreciation. I recently
contacted Dr P Clay Sherrod regarding my Meade ETX-125EC scope that had
lay dormant for a long while. I had decided to renew my interest in
astronomy and knew the scope was needing some substantive resuscitative
efforts. Despite what appeared a very busy schedule for SuperCharging a
variety of scopes and helping a huge number of people on the various
Meade astronomy groups as well as his home web site, Arkansas Sky
Observatory (http://www.arksky.org/), I received a personal and pleasant
reply suggesting he would be happy to help. I sent the scope to him and
despite a surfeit of UPS bobbles, he readily attended to my ETX,
completed the SuperCharge in short order and sent it back, miraculously
resurrected and immeasurably improved. I've nothing but the highest
regard for his efforts and veracity. (I've been a "lurker" in various
Yahoo groups and found he has quite a vocal cheering section, many
seeking his counsel and extolling his advice. And all benefited from his
wisdom and experience.) Personally, I was treated with both care and
concern, as well as a valued customer. The quality of workmanship seems
extraordinary. I think this may be one of the best service experiences
I've ever had. I encourage anyone in need of help with an ETX (or other
scopes, too) to consider Dr Sherrods service.
James S Roloff
Des Moines, IA
If, at first, you do succeed, try to hide your astonishment.
- Los Angeles Times
And:
From: sherrodc@ipa.net (Clay Sherrod) Beautiful! And I thank you so much for the comments; my hand is always out to help.... Clay
Subject: Etx90ec question - Alex Parmington, Melbourne, Austra Sent: Saturday, May 11, 2002 7:13:59 From: Aledeapar@aol.com I am writing to ask for advice concerning a problem that I am having with my etx90ec telescope. Using my 26mm, I am getting what appears to be coma problem when viewing bright stars off centre of the telescope's field of view. The distortion resembles haloing to one side of object observed, radiating inward towards the centre of view (see attachment diagram). The problem appears to get more exaggerated the further off centre the star sits: the halos appear to increase in size. This effect only occurs when using the 26mm eyepiece and only when observing small very bright objects. Is this type of distortion common to the etx90 (ie. a design issue) or is there something more serious that needs to be addressed? The eyepieces I am using appear to be clean as well as the corrector plate at the front of the scope. Can you help me Alex Parmington, Melbourne, Australia Ps. Great site - an invaluable resource of information.
Mike here: Since you show the problem is symmetrical that would seem to rule out a collimation problem. And since you say it only appears with the 26mm eyepiece, that would seem to rule out the telescope itself. However, have you done a "star test" (move a central star in and out of focus on both sides of focus)? (Be certain the telescope has reached "thermal equilibrium first.) Do the rings appear more or less concentric?
And:
From: sherrodc@ipa.net (Clay Sherrod) This problem is not with the scope but within the eyepiece and its design; this is very common with some of the 26mm Plossl eyepieces but oddly not all; it results from a very poor figure on the "field lens" (that farther away from the eye) in that particular eyepiece. This should also result in our of focus images of very bright stars appearing elliptical toward the edges, with their "major axis" in a line from the edge toward the center; as the bright star moves closer to center, the effect goes away and the star is typically very clear and sharp. It is something that will necessarily have to be gotten used to, but rest easy this is NOT a scope problem! Clay SherrodMike here: But it was so bad (assuming the drawing is close to accurate) and not something that I've seen in the Meade 26mm eyepieces I have.
And this:
From: sherrodc@ipa.net (Clay Sherrod) Mine are VERY good as well and as I have stated many times, the 26mm in my opinion is one of the best eyepieces of all for not only the ETX scopes but many others as well; there are a few bad ones out there tho' and they are showing the same symptoms as Alex is seeing. All of the JAPAN made ones have been terrific.."some" of the Taiwan made eyepieces are suspect, but occasionally there are exceptionally good ones....And:
From: Aledeapar@aol.com Thankyou very much for your quick response to my e-mail, i am pleased that it may just be an eyepiece problem and not something seriously wrong with the telescope. I will do those further tests as advised by you just to be sure, again thanks for your help. All the best Alex Ps. By the way i have ordered book from Amazon and am currently looking forward to its arrival in the next week or so.
Subject: UHTC? Advantage or Hype Sent: Thursday, May 9, 2002 10:38:59 From: trower@charter.net (Tom & Cheri Lang) On checking out online stores for a ETX scope, I noticed that some sell these scopse with UHTC (ultra high transmission coatings). Adding this adds about 100 dollars more for the scope. Is having this added make a major difference in viewing anything through the scope? Thanks TomMike here: See the Meade Announcements page on my ETX Site for a link to Dr. Clay Sherrod's test report.
Subject: Time Keeping for the ETX-70AT Sent: Wednesday, May 8, 2002 13:36:20 From: thomas.henry@magician.org (Thomas Henry) A couple weeks ago I mentioned on your site the importance of using an accurate time during SETUP with the ETX-70AT. I forgot to mention that there is a free piece of software that will set your computer's clock (IBM types) accurately to a federal time standards source. You can find it at the Nuts & Volts Web FTP download site: ftp://nutsvolts.com/ Look for the program called "nistime-32.exe". It's a very professional program with lots of features, and it's free! I use it every couple of days to set my computer clock, and then from that I set a digital wristwatch I've dedicated to my ETX-70AT. Best wishes, Thomas HenryMike here: There are many such solutions. Mac OS 9 and Mac OS X have network time sync-ing built-in.
Subject: The Galaxy's Best Sent: Wednesday, May 8, 2002 9:13:11 From: JimM983998@aol.com I have started a new astronomy topsite. To increase your visitors join here. The Galaxy's Best Jim
Subject: RE: Telescope or Spotting Scope? Sent: Tuesday, May 7, 2002 10:00:11 From: trower@charter.net (Tom & Cheri Lang) So you feel that the ETX 125ec would not be suitable for a spotting scope? I'd hate to find out that after I look up to the sky's I'd wish I had a better scope. But if the 125 would be useless for spotting, then I'd have to rethink my decision. Thanks TomMike here: I didn't say it wouldn't be useful. I was just cautioning you that it could be overkill for terrestrial use. It will work fine at low magnifications.
Subject: etx-90ra? Sent: Monday, May 6, 2002 12:23:12 From: mister018@mindspring.com Great site,love it man. got a ? about a 90ra. I just brought a sony dsc-s70 digital camera this weekend and finaly got to try it out w/the 90 last night. Needless to say I was impressed w/my results But i'm having a little trouble w/focusing. my ? is as follows; Are the focal lenths the same using the stright through vs. the 90dge bounce mirror? Ie: camera mounted to the 90dge slot and using a 45dge erecting adaptor and and same mag eyepiece in the stright through slot for focus? TIA Roger MckinneyMike here: The focal length actually changes slightly as you move the focus. So there is some slight difference in magnification but I have never bothered to measure it. As I recall, Sky&Telescope measured the amount in their original ETX-90 review a few years back. And yes, focusing can be a challenge but you are likely making it harder than it should be. For afocal photography (eyepiece plus camera lens), just focus the eyepiece to your eye and the camera lens to infinity. If you eye focuses to infinity (corrected or not) you should be OK.
Subject: Telescope or Spotting Scope? Sent: Monday, May 6, 2002 10:20:48 From: trower@charter.net (Tom & Cheri Lang) First off, your site is great. Its helping me decide on what scope I need to purchase. My wife hates your site because I'm about to spend money. (She wants new drapes) I'm very new to astronomy, but every night I go outside I automaticly look up and just get a smile on my face. So buying a telescope seems to be my answer. But I also like to hike and look at nature. So my question is, will a telescope let me view the sky and land objects. Or would a spotting scope be my answer. Will a spotting scope not give me the best clairty for sky objects? I'm hoping you tell me a telescope can be used for land objects, because I'm leaning that way. I just dont know if the wife will let me spend the money for both. Thanks TomMike here: Yes, telescopes can be used with terrestrial objects. However, generally speaking, extremely high magnifications will not be of use due to thermal currents from the ground during the daytime. So, a large telescope may not be that useful vs a smaller one. And a smaller one is more portable for hiking. The ETX-90 makes an excellent astronomical and spotting scope. You'll have the mount (and perhaps an Autostar) for astronomical use. You can even remove the telescope tube from the fork mount for spotting scope use.
Subject: Thread Size on ETX-90EC EyePiece Tube Sent: Sunday, May 5, 2002 14:27:36 From: cbickum@attbi.com (Christopher D Bickum) Love your site. Can you tell me the thread size for the thumb screw on the eyepiece tube for my ETX-90EC? Saw some replacement thumbscrews on the Scopestuff web site, but wasn't sure of the size and the ETX wasn't in their database. Thanks in advance. Chris Bickum
Subject: 2nd hand ETX-125 question Sent: Sunday, May 5, 2002 12:39:32 From: ord@012.net.il (Or Dubnov) First, thanx for the quick and (as usual) useful reply! What I wanted to ask was if this process of clutch or lock-mechanism replacement (my original post is below) is to be considered downgrading for the scope, so maybe I should go for another scope (ETX-125 of course, just not THAT one...) or is this procedure even better for me, since I get brand new parts?.. I dont know how complex or 'traumatic' this fix is for the scope. The dealer said he is contacting Meade, and will possibly send them the scope for the fix. I wouldnt mind waiting for this one, since the deal includes a 884 Tripod, Autostar, and a hardcase! but I wouldnt wait at all for a less than perfect scope... Thanx again for helping me solve this one, OrMike here: As long as you are going for the used telescope, I would let Meade fix it. It would not "downgrade" the telescope in any way.
Subject: locking clamp Sent: Sunday, May 5, 2002 7:30:14 From: Carolandmike00@aol.com My RA locking clamp has come loose and I have been looking for the right size of allen wrench to fit is but can not seem to find it. Is it SAE or METRIC? I bought my scope used and the seller did include the wrenchs. Please help. Thank You Mike in Texas
Subject: etx125 focusing Sent: Saturday, May 4, 2002 21:50:08 From: brass@uconnvm.uconn.edu The first question I wanted to ask is, can one turn the focus knob on the etx125 too far? If so, which direction is dangerous (or are both?) and what happens? I am playing a lot with my sac 7 imager and the Meade focus reducer (f:3.3) and there are large differences in the focus position for various cofigurations. The second and related question is, do you know if there is a digital focuser that can be used (or adapted for use) on the etx125? This would be a great help in being able to reproduce focusing positions. Thanks again for your dedicated and competent running of one of the most informative sites I know. Emory BraswellMike here: Yep, a digital counter for the focus would be nice but haven't come across one. Under normal operations you will reach a stop, which prevents you from turning the knob too far. The only problem I'm aware of is if you remove the knob entirely the focus shaft can fall inside the telescope tube.
Subject: re: buying eyepieces Sent: Saturday, May 4, 2002 12:29:33 From: rseymour@wolfenet.com (Richard Seymour) To: shogun@cableinet.co.uk Many UK posters in the various yahoo groups (such as http://groups.yahoo.com/group/Meade4504Telescopes/ ) have discovered good, inexpensive eyepieces from Harry Siebert, here in the US. And, although he won't lie to Customs, he -will- only charge -exactly- what it costs him to ship them. His address is hs3980@earthlink.net he has a website (?? www.siebertoptics.com ???) but i don't have the address on this system. good luck --dick
Subject: re: Sky Circles Sent: Saturday, May 4, 2002 12:29:31 From: rseymour@wolfenet.com (Richard Seymour) To: wes.trimble@sympatico.ca My planisphere does -not- know about Daylight Savings... it's a standard-time item throughout the year. DST is a -political- invention... and the stars could care less about what we squabble about down here... they just stay in their courses, live, go nova, and die without caring if you live in Grangeville, Idaho (where you're in the Pacific Time Zone, but if you drive east -or- west, you end up in Mountain Time.) (you also get wet, crossing the Salmon river) And, if you are trying to be -really- accurate, the time you dial into the planisphere should be controlled by your longitude..., not an erratic dotted line on a map. If you are on the "eastern edge" of your time zone, you could shift the time you dial in a half hour earlier and may find that it shows the stars rising, setting and crossing the meridian (the line from due south to due north) more accurately. have fun --dickMike here: Good points. But I think the one I had made it simple and just used the gross time zones.
Subject: Things to check for a second hand ETX-125
Sent: Friday, May 3, 2002 18:22:13
From: ord@012.net.il (Or Dubnov)
I'm about to buy a second hand ETX-125 from a local Meade dealer. When
at the shop for checking the scope and closing the deal, the shop owner
found that the Horizontal/RA Lock was out of order... the scope cant
lock. So he tried tightening the bolt under the lock handle, but to no
avail. He then told me he might need to change the clutch, or contact
Meade for details. My question is: Is this type of fault a common or a
rarity? What might this symptom testify about the handling of the scope
by their first hand owners? Is there anything else to be checked in this
context? I may add the scope is only a few months old ("new version", I
can tell by the help of your site of course...). Another 2nd hand check
question: Optics. Is it OK for the Eyepiece/front lens to have some dust
on it? Anything I can check in these parts? How should I regularily
clean/treat the optics?
Thanx for the help,
Keep on with your great work, and the mighty MIGHTY Meade ETX Site...
8-)
Or
Mike here: I suspect the azimuth axis lock was overtightened. So, checking the locks is a good idea. Also, just rotating the telescope from hard stop to hard stop can detect a broken hard stop or other problems (for example, there is "grabbing" as the scope is moved). Eyepieces should not have dust but some small dust particles will be OK on the objective. There is no such thing as "regular" cleaning; you clean only when absolutely positively necessary. See the Cleaning info on the Buyer/New User Tips page.
Subject: A newbie's encounter Sent: Friday, May 3, 2002 12:41:38 From: unityart@mindspring.com (Steve) I would like to relate to you my experiences with the ETX 90EC and your wonderful website. Last December, my wonderful wife utterly surprised me with a brand new ETX 90 and deluxe field tripod for my birthday. Being a relative newbie to our hobby (had a Sears refractor when i was 12) I decided that some research was in order. My first search brought up your site, and I was stunned and amazed at the amount of informative and useful information found in these pages. After a complete examination (yes, I read EVERYTHING, and followed nearly all the links), I went back to my scope, determined to deal with the mechanical shortcomings that seemed to be the hallmark of this design. Being a seriously hands-on kinda guy, I actually looked forward to digging into the scope's guts to set things right. Imagine my surprise when I found the scope to be tight and accurate, with none of the excessive geartrain slop or locking problems so often noted by others (drat!). Collimation was excellent (darn!). Pushing the envelope, I purchased Autostar. Consulting the site, I built a cable and downloaded the latest firmware. No problems (curses!). No trouble aligning (dang!). Go-to was spot on (double-dang!). It seemed that my only choice was to accessorize. First things first. Finder scope. Dismal. Had to go. I purchased the Meade right-angle finder. Much better, but putting it in the original location still left much to be desired. Really bad positioning, unless your eyes are on stalks. I set about building a custom mount that used the scope's original mounting lug and fastener location, but moved the finder a few inches further forward on the OTA (see photo). It is made from 3/16'' stock aluminum, using a jigsaw, files, a Dremel, and some hand taps. The holder itself is the barrel from a barlow that I got for free, but any 1.25'' tube could be used. The hardest part was aligning everything, but once I did, I found that the new finder could be repeatedly removed and and remounted with no need to re-aim. Next came focusing. Egad! Every time I touched the knob (when I could reach it), the scope jittered for what seemed like forever. Remembering posts on the site about focus cables, I decided to make my own. I had a flexible shaft drive from a Dremel machine with a broken end, so I cannibalized it. I dismantled it, cut the (very) flexible cable to an appropriate length, and attached a knob to one end. I purchased a propeller nut from my local hobby shop that fit the scope's focus shaft. A quick tightening of allen screws and viola- a flexible focus for $3.95. Best of all, no more jitters! Next came the tripod. The deluxe field model's method of attachment to the ETX seems poorly designed, as it allows the scope to flex and vibrate. Consulting the site, a stabilizer plate between the scope base and the tripod head was the solution of choice. Again I chose 3/16'' aluminum stock, added some 1.25'' holes for eyepieces, and a cutout for the Autostar. There are holes drilled out to accommodate the rubber feet on the ETX, making setup in the dark a snap. Another problem with the tripod was its lack of stability. Again consulting the site, I found that the triangular wooden stabilizer would do nicely. I decided to do it one better by building a storage box onto it (see photo). The lid is of laminated oak to resist warping, and the sides are maple. Its lined with not-quite-Meade-blue foam. It holds eyepieces, a level, the handbox or Autostar, and the wrenches that came with the scope. It attaches to the tripod's crosspieces using homemade knobs and the existing holes. The tripod is now rock-solid, accessories are close at hand, and can easily be stored when not in use. The last thing I found that was really needed was an external power source. I don't know if anyone else has had this problem, but one night I had to call it quits because of dew. I brought the scope inside, let it dry and wiped it down (never the optics!). The next morning, I noticed some wetness on the scope's base. It turned out not to be water, but battery acid. The only thing I can figure is that the excess moisture from the night before (it was REALLY bad) had condensed on the battery terminals and caused a short in one of the cells. Weird and scary. But, after a methodical cleanup with baking soda solution to neutralize the acid residue, I decided I'd had enough of AA cells. I purchased a 12 volt 7.2Ah sealed battery and charger. I got the whole shebang, including Tamiya-style connectors (they connect only one way, polarity-wise) at my local hobby shop for only $25. Again consulting the site, I found the proper connector for the scope. I soldered different sized spade lugs onto the battery's terminals, so that it can't be hooked up with the wrong polarity. I purchased a weatherproof plastic box for the battery, and hung the whole works from the tripod's crosspieces using a homemade hanger (aluminum again) that hooks into the existing cutouts. This also provided much needed weight, further enhancing the tripod's stability. And so all was right with my ETX. But wait! The other night I aligned as usual. Two-star alt-az. Alignment failed! Check alignment stars! Do it again. Same results. Reset Autostar, recalibrate, retrain etc.. Same results. Could this be a mechanical issue? Again consulting the site, I open up the scope (goody!) to see whats up. I knew the error was in R/A because the scope slewed way past the mark in that direction, but otherwise aimed ok in Declination. Looking at the encoder, I found a tiny piece of what looked like foam left over from the scope's packing material stuck in the encoder's teeth. Must have been in the drive compartment all along but got dislodged after a recent car trip. I used a fine brush to remove the particle, buttoned up the scope, and reset, recalibrated and retrained. Perfect alignment restored. Needless to say, none of my experiences with this little-scope-that-could would have been more enjoyable (and less frustrating) without encountering Weasner's Mighty ETX site at such an early stage. I suppose I am lucky to have gotten a Meade scope that performed so well out of the box, but I think I am luckier still to have found such a fount of information, resource, and good will as I have encountered on these pages. If anyone seems interested in any of my designs, feel free to direct them to my e-mail address. THANKS MIKE! Steven R Pilewski steve_p@mindspring.com p.s- Great book, too! Congratulations! S.
Subject: Secondary Baffle Fix Sent: Friday, May 3, 2002 12:13:46 From: jmerskin@excite.com Apparently Meade no longer offers to send you the adhesive disk to repair the secondary baffle. They offered to repair the problem if you can supply proof of purchase, else it will cost $75.00. I'm looking for a different solution......Mike here: Check the Baffle articles on the Telescopes Tech Tips page.
Subject: Solar Viewing Sent: Friday, May 3, 2002 11:17:35 From: golfing18@msn.com (Michael Knapp) I have recently purchased a solar filter fot my 90EC but have not used it yet. I hope to this weekend. What I am concerned about is the viewfinder scope. I assume that I would not want to look at the sun thru it (if I can't find the sun then I have much larger problems), but is there a possibility of damaging it when I am looking at the sun? Regards, Mike KnappMike here: Cover the aperture end of the finderscope. This keeps it cool and prevents possible damage to anyone or thing that gets into the light that would have exited the finderscope. I made a simple cover using cardboard and black tape.
Subject: UK ETX users Sent: Friday, May 3, 2002 3:40:16 From: marc.delaney@ntlworld.com (marc.delaney) Although I belong to my local astronomy society, they have fixed observing days which more often than not end up cloudy here (Wales, UK), so I mostly end up observing alone. It's more enjoyable (and safer in lonely dark sites!) if one is not on his own. There must be others in the local area with a similar problem, if so maybe they might like to contact me at marc.delaney@ntlworld.com with a view to getting up a core keen-observers group with the flexiblity to go observing whenever the skies favour us in this generally unfavourable climate. My local area is SOUTH-EAST WALES, UK. Best wishes, Marc
Subject: ETX-125 or LX90 Sent: Thursday, May 2, 2002 18:50:11 From: scoale@pacbell.net (Stephen) I love your site! You aught to feel proud about the difference you are making. Do you feel an LX90 is significantly superior to an ETX-125? If so, in what ways? Can you describe the aperture/optics trade-off? Although money is important, I want to buy scope I'll be happiest with long-term. My observing situation: 98% backyard. Light polution. (Salinas, CA on central coast), I can observe magnitude 3 stars with naked eye. Would like to take photos at some point. I currently use an ETX 90 w/o autostar. Use tracking all the time, and feel it works pretty well. Not competely satisfied with optics - but probably due to seeing conditions. Thanks, StephenMike here: Well, the 8" will see more under dark skies than the 5". And the LX90 has a better mount. And it is larger and heavier than either your ETX-90 or the ETX-125EC. Keep in mind that the best telescope is the one that gets used. If your light pollution won't allow you to get the most out of the telescope, unless you plan to take it to other locations, why spend the extra money? Also, if the telescope is too large for easy movement outside then it will get used less. On the other hand, many objects will appear larger, brighter, and more detailed in the 8". Decisions, decisions, decisions.
Subject: Interferometry
Sent: Thursday, May 2, 2002 12:51:40
From: Esacameron@aol.com
Do you or any of your readers know what would be involved in setting up
2 ETX telescopes for optical interferometry. Off the top of my head I
would guess the drives would need to be replaced. Is a Maksotuv
Cassegrain even a candidate for such an endeavour. Questions, questions.
Any thoughts? Thanks,
Steve Cameron
Mike here: Well, if you have a few spare million dollars to spend on temperature control, stability, light path equalization, etc, then send some of the money to me instead of trying this with the ETX telescopes! But seriously, you would have a problem with the light paths and eliminating all the influences on that.
Subject: Sky Circles Sent: Thursday, May 2, 2002 11:08:33 From: wes.trimble@sympatico.ca (Bud & Cecily) Sorry to bother you with such a stupid question. When using a star circle, do you use current local DST or do continue to use local EST.[eg: 11:00pm DST would be read as 10:00 on the planisphere]. Am I correct in my assumption. Does the same apply to RA circles? Many thanks, Wes Trimble Toronto Ontario CanMike here: Gee, been so long since I've used those that I have to think.... As I recall, the ones I've seen have markers for Standard vs Daylight Savings time (or perhaps instructions how to adjust). If you guess wrong you'll be off by 15 degrees (or 1 hour) so it should be easy to verify (what's on the real zenith vs what the planisphere shows). As to the RA setting circle, the best way to adjust it is by using a known object; set the RA setting circle to be the RA for the object when you have it in the eyepiece.
Subject: Re: ETX tripods Sent: Thursday, May 2, 2002 2:27:21 From: e_2_m@hotmail.com (Peter M.) Thanks for the info.......since having had a good look around your site, I have since purchased some new lenses from Surplus Shed, saving a fortune! I can now see the belts on Jupiter but I'll be damned if I can see the comet I-Z........good fun to keep trying! I'm now going to sort out my tripod. Keep up the excellent work! All the best Peter Harwich, Essex, UKMike here: Comet Ikeya-Zhang has faded quite a bit.
Subject: need advice about ETX-90EC Sent: Wednesday, May 1, 2002 11:37:45 From: shogun@cableinet.co.uk (JOHN . R) I have just got my first ever telescope I got my self an ETX-90EC. telescope with autostar 497 controller. everything is only six months old as I got the original bill of sale. what I would like advice about is the cost of accessories hear in the uk I got one price hear for the following eyepieces 15mm 9.7mm and i 126 2x Barlow lens the price hear is more or less double of the cost on us websites I want to know do you know anybody who is trustworthy who if I send the cash to them would be willing to buy the seid eye pieces and post them to me all at my cost. as if I get them send direct from a website in the us when they arrive hear in the uk I will have to pay import duties and taxes and the only way around this is if I get somebody to post them as a private package in the post all at my cost. if you can help me I will be eternally grateful. I have been using your site ever since I got my scope as the friend I got my scope off gave me your web address and I have passed it on to a couple of my friends who also think its a top website...... just one more thing I have a Sony mavica FD75 digital camera can this be linked to my scope. if so what adapter do I need.... yours thankfully::: john Roberts..London uk __________________________________________________________________ john ICQ#: 84317226Mike here: See the Helpful Information-->Astrophotography page as well as the Accessory Reviews - Astrophotography. Check the Scopetronix site for info on the Digi-T adapters for the Sony camera.
Subject: ETX Tuneup Testimonial Sent: Wednesday, May 1, 2002 9:00:48 From: mhiggins@usinternet.com Recently, I had the opportunity to use Dr. Clay Sherrod's excellent ETX-125EC "Supercharge" Tuneup Service. Let me say that I am delighted with the results. The scope works MUCH more smoothly now, and the GOTO feature is now dead-on accurate. Additionally, the DEC and RA locks were properly adjusted, and now work as they should. The checklists, reports, and files on a diskette which Dr. Sherrod provides show a very comprehensive analysis was performed. The "personal touches" he provides (setting up to 5 viewing locations in the handbox, setting of the percentages for the motors, etc, etc) are unique in my experience. All in all, I am most pleased. If anyone is considering using this service of Dr. Sherrod's, I would highly recommend it as a wise expenditure! It is definitely worth the money. Please feel free to post this testimonial on your site. Sincerely, Mark Higgins St Paul, MN
Subject: Re: DEC Scale adjusting Sent: Tuesday, April 30, 2002 19:53:39 From: ed.fides.carlos@comcast.net (Carlos Family) Thanks... I did some more search on your site and found exactly like you said "It may take some force (use a piece of rubber for opening jar lids).". Worked like a charm. Thanks Ed
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