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Re: [ATM] Cassegrain vs. Gregorian

The concave surface is between the spherical and parabolic surface and that
is easy to do.  More difficult is to depress a ring on the convex surface
and then be able to measure it accurately, especially since the curve is a
lot more than doing a parabolic surface on that convex surface.  I think
that you are thinking backwards.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net


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