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I believe that slight deviations from flatness in glass have very little effect when viewing something held right up against it, compared to viewing something far behind it (as when looking through a window). I would also think that a scanner, since it presses its own nose right up against the glass, so to speak, would be even less sensitive to ripples in glass than a person viewing a framed picture through the same piece of glass from a few feet away. I'm not optical scientist, so if anyone knows that I'm wrong about this, please explain why. But it would be pretty easy to test: just install a piece of window glass, and scan a test print of a very fine grid. -- Ciao, Paul D. DeRocco Paul mailto:firstname.lastname@example.org > From: Arthur Entlich > > I do understand the desire for optically flat glass > for this application. And although window glass that I've seen tends > toward slow ripples and distortion, most of the framer's glass I have > worked with has been fairly optically "pure" (although not always). - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.