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Author
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Topic: Funny light artifact
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John Walsh
Film God
![](http://www.film-tech.com/ubbmembers/168.jpg)
Posts: 2490
From: Connecticut, USA, Earth, Milky Way
Registered: Oct 1999
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posted 04-21-2000 10:56 AM
How about just making a loop using the dark "run-out" on the head/tail of a trailer or print?I'm guessing but, are you sure it's something that's comming through the lens? I'm sure you've looked at the screen with the dowser closed, but what if you put in a blank aperture plate? Or, block the light around the projector port, except for a cutout exactly the size of the light beam. Could light be sneaking out somewhere else and, say, going out the viewing port? Is there an exit sign with it's cover open nearby, or some other light source? The reason I make these suggestions is that I never saw that kind of problem with a mis-aligned lamphouse; other light problems, yes- but not a streak of light. Did this just happen, or did you just install the lamp? If you're sure it's comming out the lens, I would check that: the reflector is not stained or damaged; the lens is not cracked; something like the dowser or zipper shutter is not hanging down too far, or the paint got scraped/burned off of the regular shutter- reflecting light back to the reflector.) Put light on the screen with the projector running, but no lens installed. The rings should be concentric and centered in the screen rectangle, with a dark blob in the center. If so, then the lamp is aligned (maybe not perfectly, but) enough not to have this problem. I don't think adjusting the XYZ settings will fix this, unless something else is wrong, and changing the aiming corrects for another problem. My own 0.02 worth, which is probably worth less.....
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