Mark...I am curious...do you actually have a phase shift rig? I spent a good deal of time a few years ago trying to get a questionable optic tested in Australia, and could not find anyone (including the CSIRO) with anything larger than a 4" Zygo.
But I digress. Both Star and AP get the required density by taking many samples over multiple orientations.
And the coup de-grace for smoothness would be Ion-Milling offered by RCOS....a process hard to replicate by pushing glass and using a null test
Quote:
Originally Posted by Satchmo
I maintain that edge data often doesn't make it into final consideration at all due to lack of sampling density.
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