Quote:
Originally Posted by Gama
You cant have droop at all, and the major issue with RC's is that as you go out of collimation, the more severe/crappy the image gets. Where other scopes can take some miscollimation, the RC's need near perfect alignment.
Theo
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Thats correct. With two highly aspheric surfaces used in conjunction ,the optical axis' have to be very coincident or images deteriorate very rapidly.The primary mirrors on these instruments would be around F3 and hyberbolic.