Quote:
Originally Posted by Bolts_Tweed
Thx guys
Yeah I found it necessary to push it for the outer detail. Looks like its going to be fine tonite so I can cover the blown out core.
Ive been toying with the idea of going RC as well but this AP is like driving a ferrari compared to what i'm used to so i tink i'll stick with it for a while.
Mark
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If you do go larger aperture I would suggest corrected Dall Kirkhams or corrected Cassegrains. I guess they are all quite similar now as even an RCOS needs a flattener ideally with the larger chips these days. So its 2 mirrors of whatever shape and a corrector/flattener that seems to be the u-beaut formula.
Planewave CDK is best bang for your buck or perhaps Orion Optics UK optimised Dall Kirkham although he is not meeting delivery times currently and there are very few examples out there with proof of performance although I believe their instruments will prove to be awesome.
There is a new RC maker from Germany selling on Astromart (Anacortes). Alluna. Their spot sizes are amazingly low. I see they also have a built in corrector/flattener which is as I say all the rage now.
The "advantage" of CDK is the primary mirror is easy to make so its easy for them to get it very accurate like a Newtonian. RC mirrors are not easy to make hence the high cost for these high end scopes.
Your 130 would also make an awesome widefield scope with a large chip and an RC would make a great instrument for galaxies, planetary neb etc.
At the end of the day unless your long focal length image is really super well done you will produce more pleasing images with your AP130
more often.
Greg.
of course it helps having almost the best APO available too 
) but I easily remember thinking the images in that were mind blowing. I would be dissapointed if I got someof them now. Although not fair to compare - I'd love to see what David could come with digitally with all that gear.
