CGEM 11 for astrophotography? Anybody doing it?
Posted 23 November 2012 - 12:26 PM
What I'm looking for is first hand experience from C11/Cgem owners. Good or bad...
I can get a C9.25 OTA for just over $1200 or a C11 OTA for just under $1700. I would love the extra 1.75" but not at the expense of nightly frustration.
I do plan on adding a TPI tripod spreader assembly ( http://www.tpiastro.com/spreaders.htm )to my CGEM either way to improve stability. I have "heard" (no first hand experience)that it will improve the mounts capacity to over 50 lbs. With the spreader, proper balancing and short tripod legs is this dream a possibility or craziness?
With a C11, camera, guidescope and dewshield I'm looking at around 32-34 lbs of equipment.
Anybody having success with a CGEM/C11 in AP?
Thanks in advance and clear skies :-)
Posted 23 November 2012 - 12:52 PM
Posted 23 November 2012 - 06:51 PM
55 views and no one can say that they are successful at AP with a C11 on a CGEM.
I'll start looking for a good new or used C9.25. I had a feeling...
Clear Skies :-)
Posted 23 November 2012 - 07:49 PM
All I can say is I have a CGEM with the C9 and I think this would be the limit at least if you want to shoot DSO's. Although I piggyback my 7 lb APO on top of the C9, once a while the gears start slipping if you dont tighten the locks on the mount. This would be approximately the weight of a C11 if you catch my drift.
Posted 23 November 2012 - 11:37 PM
Posted 24 November 2012 - 11:45 AM
I forgot to mention I plan on doing a lot of visual work with whatever scope I get.
You would be OK for visual work but would want to add a motorized focuser.
Here's my answer from the Yahoo group.
The first thing I would ask is, what is your AP experience level? Assuming that you are not planning on HyperStar, if you have a lot of experience with AP and with mount and setup tweaking, then the combination might be OK for you. You would need to plan on tuning the mount, since it will need to be working at its best for this load.
I do have this combination, but do not use it for imaging. I personally feel that the CGEM stuggles with it, even when tuned and balanced. The CGEM DX does better because the DX motor board seems to run the motors smoother.
I don't recommend the combination because I have spoken with too many people who have bought this combination only to end up selling it out of frustration. If you really want it, then there are steps you can take to help yourself out.
First, tune the mount. Second, start by using a HyperStar. Third, after mastering HyperStar, move to prime focus with a focal reducer. Finally, if you have mastered these, then try prime focus AP.
Posted 24 November 2012 - 01:22 PM
Posted 24 November 2012 - 10:03 PM
I plan on using the C11 for imaging the planets and Moon, unguided.
If you are only going to have one OTA for astrophotography I would recommend a much shorter focal length. You actually need a small collection of different scopes for the different things in the sky. The C11 would be one of the last ones to get unless you were primarily interested in the planets. I would start with the C6, C8, or an APO refractor.
Posted 24 November 2012 - 11:15 PM
Thanks again guys.