Quote:
Originally Posted by tnott
Also mentioned that he might be going to even faster focal ratios with the development of a new special Parracorr for F3-ish mirrors.
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There will be limits to what an F3 Paracor can do in that eyepieces themselves ( even Naglers ) aren't designed to handle such fast light cones. I don't see much practical point in going faster than F3.5 on a 20" or F3.3 on a 24", as the scopes are allready quite eyepiece friendly in a dob.