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Flatness testing box?
I am interested in testing optical flatness. I did come across a method that used what looks like a red light (monochromatic?) and a plastic diffuser. The globes looked like the energy saver type, but with a red glow. The box had a pane of glass at a 45deg angle. The piece to be tested was at the bottom of the box.
I wish I had it bookmarked. Has anyone seen the clip? Please give me a link to it?
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