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Author
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Topic: Fairly cheap double coated glass for port windows.
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John Pytlak
Film God
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Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 06-20-2005 08:26 AM
8x10 inches is quite small, and may not be sufficent for short throw applications (shorter focal length lenses). You do want some clearance in front of the projector.
LEXAN and other plastics often "light pipe", with internal reflections causing flare. Optical quality glass with anti-reflection coatings is best:
Conquering Contrast Killers
quote: Contrast Killer 5: Poor Ports The projection port is just as important as the lens in delivering high-quality images. Plain window glass should not be used. Only optical quality glass with anti-reflection coatings should be used. Port glass should never be installed perpendicular to the projection beam, to avoid reflecting light back into the projector lens. Likewise, if two panes of port glass are needed for sound isolation, care should be taken to avoid internal re-reflection. Soundproof, angled port glass frames are available from several vendors. Port glass should be absolutely clean and scratch-free. As with the projection lenses, loose dust should be gently brushed away with a camels-hair lens brush, and liquid lens cleaner and lens tissue used for cleaning any haze. Ideally, the projected image should be almost invisible on the port glass, with no detectable scratches or haze.
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