Yep Raymo is spot on the FOV is of concern, I was imaging the sculptor galaxy and when I zoomed and crop it started to get pixelated. So a F4 at 800mm will limit your final blow up of the DSO.
What DSLR are you planning to use?
Quote:
Originally Posted by raymo
My 8" is f/5 and I often wish for more magnification, so I would
certainly not go f/4, although having said that, it also depends
upon what you want to image. Small planetaries, for instance
require lots of mag.
raymo
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