Quote:
Originally Posted by glend
It would be a colour ASI camera, yet to be purchased. Focal Length likely no more than 760mm, not less than 400mm.
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Given those choices and also your stated "need for speed" one scope I'd consider would be the Vixen 140ss or 140ssf at f/5.7 it's one fast refractor and reasonably unique focal length/aperture combo with 4 element petzval construction that doesn't cost the earth (TAK, AP, etc..). For focal lengths below that
and if high speed is a necessity I would consider high quality (
used) telephoto lenses something like a 600mm f/4, 500mm f/4 or 400mm f/2.8 adapted to astrocam use. At their level of performance they tend to be reasonably well corrected for flatness and colour and they don't have to be crazy money if you stick to manual focus used lenses, shop around and don't mind the odd cosmetic imperrfection.
What ever you get it would be good if it could support a full-frame image circle so that you have more camera options: Full-frame, APS-c, ±reducers, ±extenders, etc....
Happy Hunting
Best
JA