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Ed Jones
Pooh-Bah
Reged: 04/06/04
Posts: 1415
Loc: Sin-sin-atti
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Re: flat mirror tests
07/03/09 11:32 AM
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Stepping back 45 feet would work. A collimating lens is much simpler. Many projection TV screens have fresnel lenses which work nicely, you can sometimes find them on ebay cheap. I have several that I cut the center area out for a collimator lens.
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Ed Jones
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