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dothead
super member
Reged: 08/13/08
Posts: 162
Loc: Heidelberg, Germany
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Re: classical cassegrain with flat mirror?
08/16/08 10:03 AM
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Yes, one could do it that way, but still, the secondary flat would not be significantly less than 50% (don't forget that you also need some backfocus) - and because of the barlow, you'd have a slow scope.
The same f-ratio as above will be achieved by a Classical Cassegrain (hyperbolic secondary), with significantly smaller central obstruction than your proposed barlowed folded Newtonian.
Ralph
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