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Re: ATM 12.5" Double-Arched Mirror & Light Scatter




>>> Has anyone else had problems with TDE in the image which varied with
temperature?

Oh yes, I've seen this for many years.  I alluded to it recently.  It is not
just turned edge, but all zonal discrepancies that are highly exaggerated.
I like dunking the mirror in warm water, and immediately commencing to test.
Though the mirror figure is shaking violently, one can discern the
heightened zonal errors.

Mel Bartels