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but it is the size of the coma which does not change when you up the power say 2-fold: at the same point in the AFOV, you are 2x closer to on axis, so coma is 2x smaller, but you're mangifying 2x, so it would stay the same. It's the same star with the same apparent size so you'd expect it would look the same (as long as Airy disk is unresolved). Don, interesting point about background sky brightness, yet things go the other way. These are all things I have not really thought about before all that much and never had a look at what they really mean in practice. Maybe time to have a critical look at stars at different powers with the f/4 Newt. (although I don't think the mirror is very good in that one.)
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