Celestron CGEM vs CG-5 mounts
Posted 01 April 2011 - 09:15 AM
Posted 01 April 2011 - 09:32 AM
The CG-5 is very capable of handling the 9.25 and weight wise is much, much lighter. I'm not sure of the weight, but I carry mine in one hand. As for AP work, it is possible with the CG-5 although some what more work and possibly limiting at times. The CGEM is a much steadier platform and a bit more precise than the CG-5, but people are getting very good results from the CG-5. When just starting out in AP it should serve you well.
Posted 01 April 2011 - 09:54 AM
the CG5-GT is a good mount for starting astrophotography and it can give great results but in long exposure the C9 is a litle bit too much for it,if astrphotography is the purpose of the setup.
The CGEM is with no doubt far better than the CG5-GT and more capable o carying the C9 without pushing the mount to it's limits.
From my personal experience an ASGT (alias CG5-GT) mount can handle with no problems for long exposure a total weight up to 10kgs ( i think thats a about 25pounds give or take).I'm using my setup at this weight ASGT+C6+Equinox 80 ED +Canon EOS 500D+rings etc and it works just great.
More than that and i think you will have excessive vibrations or balancing will be more critical or even the telescope will be more affected from the wind.
It all depends from the use you wish to do.
The CG5 wont' break under the weight of a C9 but i'm afraid you won't be able to do more than Planetary immaging with a light webcam such as an SPC900N or a Neximage,at least not as you would like to.
I hope this info helps
Posted 01 April 2011 - 10:22 AM
The CGEM is very heavy and weighs more than the 30 lbs you are looking at. The GC5 is capable of having the 9.25 for visual, but I would not recommend it for imaging. The CGEM with a guide scope on the 9.25 is over the recommended weight limit. The below was taken with the 9.25, rings and an 80MM APO as a guide scopen so its doable, but any wind stops the AP process.
My recommendations if purely visual the CG5 is adequate. If imaging the CGEM is capable but its a beast.
Posted 01 April 2011 - 11:23 AM
Posted 01 April 2011 - 03:44 PM
Posted 01 April 2011 - 03:47 PM
For imaging a fast small scope is really all you need. For Visual aperture rules. The club members that start imaging with a C8 and GC5 all sold the GC5 or the C8. The focal length was too long to get images with the C8/GC5 combo (not that it can't be done, but its not easy and not recommended for a beginner). The GC5 is a good mount, but you really need to consider the weight that you put on it for imaging.
Posted 01 April 2011 - 03:57 PM
Thanks for the input so far! As far as weight, It sounds like the CGEM is too heavy. I wondering if it would be "better" to drop back to a C8 on the CG-5, due to weight of OTA and also wind if trying to use for basic AP, although I hate to lose the extra 1.25" diameter.
Are you hoping to replace your current CPC-9.25 or something?
Posted 01 April 2011 - 05:48 PM