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Re: [ATM] A two way null test for convex hyperboloids

Mike,
Thanks for your insights. I'm also bound to think that perhaps
fabricating an additional spherical test surface might be simpler in
practice. I do not know... If I ever get around to fabricate a Cass or
RC secondary I'll try the two way null and see how it works. There is
an inherent "beauty" in the fact that the two surfaces converge to a
desired aspheric...

What's your opinion on direct interference testing of the surface with
the polished tool surface as a reference and using fringe analysis to
measure the surface deviation from the reference? Are there problems
if the deviation is to big in asphericity and/or curvature?

/Mauritz
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