Quote:
Originally Posted by Roger Davis
A few blemishes and scratches wouldn't matter as they don't come into focus. You are, after all, focused on infinity not the mirror 100mm in front of your objectives! You don't need perfectly optically flat glass either, although it may help. A piece of float glass will be relatively flat enough to have aluminised and then used in this fashion.
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True, but we're not focusing on either the primary or secondary mirrors in a newt either, so I figured they would still have an effect just as scratches/blemishes/dirt/dust on the mirrors in a newt affect contrast and resolution.
Whether it's perceptible thru the bino's, dunno. Might try it out.