Last updated: 17 December 2007
This page documents Canon DSLR camera comments, tips, and photos. Search the site for "canon dslr" for other items about the Canon DSLR cameras. Contributions welcome.
Subject:	RE: Astrophotography w/Canon XTi
Sent:	Thursday, December 13, 2007 08:56:55
From:	French, Winsor (
I don't know if you remember me, but I sent you an E-Mail back in Oct
About taking Astro photos wit my new 35mm Canon Rebel XTi.

Anyway..You were 100% correct. I have GOT TO get a stable, rock solid
tripod if I want to take any decent photos. So I'm looking into an
Azimuth mount for my Orion Apex 102mm scope. It just ain't working...
Anyway I have been able to take a few decent shots , but those have been
3 out of 30...

Mike here: Yep, a stable mount will make a LOT of difference!


I took them Wed nite from my driveway.


Mike here: Definitely mount vibration; probably from the mirror flip motion in the camera.

End of today's update
Subject:	RE: Astrophotography w/Canon XTi
Sent:	Monday, October 29, 2007 09:59:05
From:	Dave Wallace (
(In reply to an inquiry from WFrench your ETX astrophotography area.)

The Canon XTi has a mirror lock-up feature that will probably serve to
avoid vibrations and is simpler to use than the hat trick.  The remote
is useful, too, in that it decouples your body from the telescope, but
mirror lock-up is the way to go: this feature will flip the mirror
several seconds before the shutter fires.  Without being able to track
and when using a long focal-length telescope, you're going to have
significant problems with sky motion for exposures longer than 1/4
second.  DSOs are probably out, but planets and the moon will be fine,
even at fairly low ISO values.  I'd recommend playing around at ISO 400
and exposures from 1/10 to 1/250th until you like what you see.

You want a T ring for an EOS mount.  Use the RED dot on the mount to
align the adapter when attaching it to the camera; the WHITE dot is only
for EF-S lenses.

End of 31 October update
Subject:	Astrophotography w/Canon XTi
Sent:	Thursday, October 25, 2007 13:51:51
From:	French, Winsor (
Just finished browsing your Canon Astrophotography page I just ordered
the Canon XTi 10.2 meg Camera this past week. I was doing some surfing
on the web and found your site. I am looking forward to seeing how well
the camera will work out. Originally I was going to use a standard 35mm
SLR but due to age, and condition the camera wasn't going to work so I
decided to get the Canon.

I have two scopes an  8" Dob  and a 103mm Mak/Cass spotting scope. They
will both provide their challenges as neither one is computer driven. 
Should be fun??????

Got any helpful hints????
Mike here: Of course, you will need the proper adapters. And you will be limited to short exposures since neither of your telescopes have a Right Ascension clock drive. I suggest starting with bright objects like the Moon, the Sun (assuming you have the proper solar filters), and the brighter planets.


Thanks for the reply...

I've got the camera adapter so I'm good there, but I still need to get a
T-ring adapter, and I only have a Moon filter at this time. I've been
thinking about getting a 1.25 UV but haven't done so yet. My plan is to
focus [no pun intended] on taking sunsets, moon shots, and other types
of long distance photos.

Someday I might take the plunge and get a clock drive telescope, but for
right now I'm just going to play around. As I have never gotten into
photography this will be a leaning experience from day one. And
fortunately I've purchased a great camera to play with.

Have a great weekend...

Mike here: Unless you have really sturdy mounts you will need to avoid vibrations from the "mirror movement". What you need to do is use the "hat trick" method: hold a "hat" (I use a piece of black cardboard) over the objective of the telescope, open the shutter ("bulb" setting), let the vibrations settle down, flip the "hat" out of the way for the exposure, then cover the objective again, and close the shutter. On bright objects like the Moon it will be a challenge to get a short enough exposure but with practice it can be done.


I was planning on getting a remote control for the camera so there
hopefully won't be the possibility of vibration when I take a photo. Or
are you saying it's just a mechanical aspect of the camera? As to the
Moon, since the XTi has various shutter speeds it would seem [yeh right]
the Moon would be easy to shoot! From what I've been reading [I have
also bought a book on Astrophotography] a standard SLR would have been
better than a digital but I thought for overall use the XTi was a better
idea. Also from what I've read, it looks like I've bought a really nice
camera that takes really nice photographs....BUT.... astrophotography is
a really challenging type of photography [especially when using a
digital camera] and can be very frustrating! It ain't like you "point
and shoot" and you get these really kool photographs like you see in
National Geographic. Well the camera should be here this weekend. It
will probably take a few weeks to get use to it. I'll get the T-ring,
and then it will be "point and shoot" and see what happens. Thank
goodness we now have digital cameras where we can see what we're doing
and make corrections as we go alone instead of wasting $6,zillion
dollars in film developing. One last note, I have also read that I will
probably need a "focal reducer" As my Mak is an F12 and for photos I
really should be in the F4-6 range. There goes another $160.00.
Mike here: The movement of the mirror is mechanical so it will likely induce vibrations in the telescope, resulting in blurred images. At really short exposures you may not notice it but at longer exposures you will. And yes, a focal reducer can help, especially with fainter objects.

End of 28 October update
Subject:	Butterfly Cluster
Sent:	Saturday, September 22, 2007 18:44:47
From:	Agustn Abeledo (
On the left, a picture taken with a Canon EOS Digital Rebel 200mm
piggybacked on an ETX 125 with a homemade adapter. 30 sec shot at 800
ISO. Cloudy, bright night. Buenos Aires, Argentina.

On the right, a picture of the cluster extracted from "Starry Night
Backyard" software.

I must say I'm quite satisfied with the tracking. However I didn't get
the chance to try higher magnifications. Next time I guess...


Go to the February-August 2007 Canon DSLR Astrophotography Page.

Go to the 2006 Canon DSLR Astrophotography Page.

Go to the 2005 Canon DSLR Astrophotography Page.

Go back to the Astrophotography Page.

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