CPC to CG5?
Posted 20 March 2013 - 12:21 PM
Thank you, Kasey
Posted 20 March 2013 - 12:50 PM
Posted 20 March 2013 - 01:30 PM
Thank you Kasey
Posted 20 March 2013 - 02:24 PM
Posted 20 March 2013 - 05:54 PM
Posted 20 March 2013 - 07:14 PM
The CGE is an older and now discontinued mount that has a 60lb carrying capacity.
Putting a C9.25 on a gem for imaging means that your starting with a 20lb ota, then you've to to add camera, focal reducer, filter(s), and an autoguiding setup so you're probably now pushing 30lbs. For popular mounts the rated capacity is for visual use and for imaging you generally cut that number in half or by a third. With high end mounts you tend to be able to image at or even sometimes above their rated capacities.
So a CGEM rated at 40lbs would be borderline with a fully configured C9.25. You'd definitely need to be using a focal reducer to cut the effective focal length (imaging with shorter focal lengths is easier on the mount) and use an autoguider. I think you'd be happier with the DX model. I also agree with Psyire that the CPC with a solid wedge is also no slouch at imaging.
Posted 20 March 2013 - 08:50 PM
Posted 20 March 2013 - 08:54 PM
Also remember that those PE numbers are with the C11 and a 80mm refractor piggybacked on the wedge mounted CPC.
Posted 20 March 2013 - 09:25 PM
Posted 20 March 2013 - 10:50 PM
I have both Cpc1100 and Cg5. I recently got a wedge for the cpc which previously I could scarcely get 25 second exposures with my mallincam before star trailing. I have not yet tried imaging with the wedge but I expect to get much better and be able to guide. Now as for the Cg5 I have had a C8 plus a C80ed with finder, telrad and mallincam and filter wheel. All told it was 29 lbs. and the little cg5 was able to go 2-3 minutes with guiding without any trailing.
You already have a good setup with the 9.25 cpc. I agree the cg5 is a good deal now. Why not but a refractor or other wide field scope as a complement to your. 9.25 SCT? Mount that on the cg5 and leave your fork mounted cpc as is...
Posted 21 March 2013 - 08:09 AM
Then had tracking, Go-To, and alignment problems,,, handset fixed that... Now when its on its awesome.. Was just thinking all the viewing/photo oportunities I lost with the problems,,,, May be one of those "Grass always greener on the other side" ... As always geat advice,,, and may do as Al suggested, a CG5 for the Orion 80 on my CPC to use as portable for star parties etc...Just use Mallincam and little DVD player.. ,, AL do you have the GPS addition on your CG5??
Thank you all, Kasey
Posted 21 March 2013 - 09:01 AM
I also like Al's suggestion of a smaller wide field scope on the CG-5 as an alternative platform. For star party and any remote site work the KISS philosophy is very valuable. I think you'd find a smaller and easier to setup and take down scope with very basic video control and viewing a really nice addition to your CPC.
GPS? ... that's just one more thing to plug in, suck power, or fail ... remember the KISS philosophy.
Posted 21 March 2013 - 09:20 AM
Posted 21 March 2013 - 09:46 AM
Posted 21 March 2013 - 10:48 AM
Posted 21 March 2013 - 03:04 PM
GPS and polar finder scope are superfluous to the CG5, save the $ and use it for something else. In today's gps equipped cell phone world it's easy enough to get coords and just type them in
Posted 21 March 2013 - 03:24 PM
Posted 21 March 2013 - 06:09 PM
When you put a rail/bar onto a C9.25 you need both the appropriate length rail and a couple of radius blocks. The blocks are curved to match the tube on one side and mount to the pairs of raised head bolts on the front and rear cell that are spaced about 1.75" apart. The dovetail bar is then bolted to the flat side of the radius blocks.
You then have a couple of choices to mount the 3 point rings for the refractor to the bar. 1) bolt the rings directly to the bar. This is how the Orion autoguider package is setup. It's cheap and nice and solid but very inflexible. You'll need to ensure that you've got everything well balanced before you go and drill the bar. 2) bolt the rings to a pair of small Vixen/CG-5 saddles. This setup costs and weighs a bit more but gives you the flexibility of moving the scope up and down the bar.
With either option you can also add other items like DSLR mounting points and the like.
Posted 21 March 2013 - 06:20 PM