Last updated: 30 November 2005

This page is for user comments and information specific to the Meade ETX-90RA (originally known as the "ETX Astro"), the ETX-90EC, and the ETX-90AT. Comments on accessories and feedback items appropriate to other ETX and DS models are posted on other pages. If you have any comments, suggestions, questions or answers to questions posed here, e-mail them to me and I'll post them. Please use an appropriate Subject Line on your message. Thanks.

Subject:	What eyepieces do you recomend for a ETX-90AT?
Sent:	Monday, November 28, 2005 13:43:51
From:	Mauricio Lpez (
I recently bought an ETZ90AT telescope, and now i want to buy another
eyepieces ( the telescope comes with an 26 mm ),  what do you recomend,
a Meade eyepiece or another one, and is it better to to go dawn with an
9mm or to go to the limit of 4 mm?

Vixen is a good choice?
Thank you Mike for your recomendations.
Mauricio Lpez
Mike here: Keep in mind the maximum theoretical magnification for any telescope; see the FAQ page if you don't know how to calculate this. Seeing objects well at higher magnifications will require you to train yourself how to see objects. While it is possible to exceed the max on bright objects like the Moon and brighter planets, you may find the views somewhat less than pleasing at times. That said, I suggest starting with a 2X Barlow Lens, giving you a "2nd eyepiece" of 13mm focal length. Then as you add more eyepieces later you can effectively double their number by using the Barlow Lens. You will need a "shorty" style, such as the Meade #126. See the Accessory Reviews: Eyepieces page for more info as well as the Helpful Information: Buyer/New User Tips page.


Mike, thank you for your recomendations, what is your opinion about the
other brands of eyepieces, Vixen Lanthanum, William Optics, Televue,
Questar, etc..., are they better than Meade or Meade is ok for the ETX

Thank you again
Mauricio Lpez Tovar
Mike here: Certainly the higher priced eyepieces such as those you mentioned are excellent but they are also somewhat overkill for the ETX. That's not to say you won't get a lot of excellent views from them but for the price, you won't get that much better views. If you want to spend half or more of the price of the ETX for an eyepiece, AND you think you might get a larger telescope later, then feel free to spend you money that way. On the other hand, lower priced eyepieces can still be acceptable. Just don't go too low. See the Eyepieces reviews page I mentioned.
Subject:	re: damaged ETX motor mount
Sent:	Saturday, November 26, 2005 10:47:48
From:	richard seymour (
Another alternative is to send it all to Meade for repair/refit.
Give them a call (800-626-3233), and you may find that the price for
the job is far less than you'd expect (and you'd be -ahead- of the
post-Christmas rush).

good luck

Subject:	damaged ETX motor mount
Sent:	Thursday, November 24, 2005 07:10:31
From:	Bakker, Ben (
I was looking for solutions to my damaged ETX-90 (MEADE) telescope and I
came across your site.  Recently the ETX-90 was washed away in a flood. 
The electronics are shot but the scope itself was salvageable.  So now I
am trying to find a way to redo the mount and the autostar system.  I
was wondering if the mounts are compatible with other Meade telescopes. 
Are there other options you might know of to deal with my problem?  Any
assistance you could provide would be appreciated.

Ben Bakker
Mike here: Sorry to hear about the damage. There are several alternatives. You can mount the OTA onto some DS mounts (see the Helpful Information: Telescope Tech Tips page for several articles on this) or you can look for a replacement ETX base (there is even a tip on the Telescope Tech Tips page about using an ETX-70 base). If you want to try for a replacement, checkout Telescope Warehouse (link on the Astronomy Links page).
Subject:	From ETX90AT to ETX90EC
Sent:	Thursday, November 24, 2005 02:20:14
From:	Giancarlo Mari (
HI, many compliments for this site!!! I write from Italy, and i'm sorry
for my bad english.

I saw the others mods for the ETX on DS mount, but i don't find the DS60
or DS70 models on web, only find DS80 model, well...if possible to do
with the DS80 mount???? Thank you so much.

Mike here: The older models may have disappeared. But following the advice in those articles you could probably mount an ETX-90 OTA.


Thank you MIke. Could i take a few minutes of your time??? I try !!!! :-)

I found an ETX 70 EC mount......the ETX 90 OTA can fit in this mount????
or the mount is too small for it???

Thanks a lot.
Mike here: My apologies; I thought you had found those articles. See the Helpful Information: Telescope Tech Tips page.


i will try to find this information.
Bye and thanks.
Mike here: They are in the Mounts section.


Thanks a lot Mike, i found it !!!!!

Subject:	Conversion of old ETX (without Autostar) to a Go To Telescope
Sent:	Monday, November 7, 2005 19:53:58
From: (
I know I am hopelessly behind the times but I was wondering if you knew
of a way that the original ETX Astro telescope (the model that came out
WITHOUT Autostar) can be converted to behave as a GO TO telescope. I
want to share the telescope with my friends and family but they lack
patience and would like to be able to use one that will go to any star
they want via computer control. Is it possible to do or is it cheaper to
just buy a new one in the long run?
Mike here: See the FAQ page for info on "upgrading".
Subject:	ETX_90EC_Autostar Controller
Sent:	Wednesday, November 2, 2005 12:14:23
From:	Matthew Checketts (
Hi, my name is Matt.  I am from Mesa, AZ, and I have actually written in
before.  I really appreciate your website.

I am running an ETX 90 EC with an Autostar controller.  I have just
recently updated the software for it, so I think it is running the
current version.  I use Alt/Alz alignment.  Before I updated the
software, I was using the scope and it slewed very accurately to most of
the objects that I was trying to view. I was observing Mars and the
moon, and occasionally a bright star such as Vega. The situation I am
describing below is while using a 25mm lens, and maybe with even with a
Barlow lens.

Since I updated it, it is not quite as accurate.  For instance I will
have it slew from the moon to Mars and it gets close, but Mars will be
just outside of the view.  I usually hold enter for five seconds until
it says "enter to sync" then I will center the object and press enter.

After that it will be pretty good for one or two more objects, but it
slowly becomes less and less accurate.  I have even calibrated and
retrained the drives.  Am I just expecting too much from the telescope? 
I want it to center the object every time, especially while using a low
power lens.

I am looking forward to your input.

-Matt C.
Mesa, AZ

P.S. With a 3.5 inch scope like mine, would it be worth it to try and
take long exposure photographs with a 35 millimeter camera, or is it too
small of a scope to really get any decent pictures?
Mike here: I would suggest doing a RESET, CALIBRATE MOTORS, and TRAIN DRIVES. You will need to re-select your site after the RESET. This may clear up the oddity since you had good results before the update. If not and you want to regress to your previous version, see the Autostar Software Archive on the Helpful Information: Autostar Info page. As to long duration astrophotography, it isn't the size of the telescope that matters so much as the accuracy of the tracking. You can do some nice piggyback astrophotography with your 35mm camera mounted on the OTA. Keep in mind that you need to mount in Polar Mode to avoid "field rotation" in the image.


Thanks for your reply.  What is the OTA?
Mike here: OTA = Optical Tube Assembly. There are piggyback adapters that go around the ETX tube and hold a camera. See the Accessory Reviews: Astrophotography page as well as the Helpful Information: Astrophotography page.

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