Quote:
Originally Posted by daveg
Thanks Guys
Trevor - Thanks for your kind comments. BTW want to get a newt for planetary work, what is your spec or what would you recommend. I have a CG11 the optics of wich I was never truely happy with.
Dave
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Hi Dave,
I have a 16" F4.5 Newt, it was a Meade Starfinder but is highly modified. It is on a very heavy GEM that was designed and built by me. I built a Peltier cooling system for my primary mirror that, in times of good seeing, makes a considerable difference.
Your C11 should do the job, unfortunately I have heard from many amateurs with the C11, regarding good ones and crook ones. Even with the C11 an active cooling system should help.
For planetary imaging I use a DMK 21 AU04.AS, an Orion filter wheel with Astonomik type II RGB filters. Nagler Powermates seem to be very widely used in Planetary imaging circles and I have trialled a 5x Powermate but it was not suitable for my imaging setup.
My filter wheel and DMK mount add 70mm to the distance from the top surface of the Powermate to the CCD in the DMK, this results in the Powermate delivering 7x. My 16" Newt already delivered a very nice image scale and at 7x Jupiter would not fit on the DMK chip. I have since settled on a Televue 3x Barlow, with my filter wheel plus a 30mm extension, it delivers 5.3X and in good seeing razor sharp images. The image scale this delivers leaves enough of my CCD chip unused, top and bottom, to comfortably track Jupiter.
Regards
Trevor