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Author
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Topic: Is your booth too dark or too bright?
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Greg Pauley
Expert Film Handler
Posts: 173
From: Huntington, WV, USA
Registered: Jun 2000
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posted 08-03-2000 12:08 PM
Most projection booths I've seen have a common problem, either poor lighting or too much light bleeding thru the port windows. We've all seen the poor guy sitting in the auditorium with his bald spot highlighted by the lights from the booth. I worked on an 11-plex project last year and was involved with the designing of the booth from the start with the architects. We did the traditional booth lighting with two swivel lights over the projector and platter with 4ft 4-bulb fluorescent lights for extra lighting during non operating hours. After we open the complex, I was not satisfied with the amount of light in the booth during operating hours. I wonder how many prints are scratched or problems over looked because there wasn't adequate lighting in the booth. Think about it, how many times have you seen a computer tech working on a computer or other technical work being done with the lights turned off. I started working on this problem and found a solution that works for our port windows. I have listed a web site below where I have posted pictures. First, I cut out a piece of 5/8 plywood to fit the larger window in front of the projector. I placed the plywood in place and started the projector and marked where the flat/scope hit the plywood and cut this area out adding a couple of extra inches. Second, cutout a top flap and left & right flap to enclose the image coming out of the lens. The flaps will need to be long enough to reach about 2-3 inches from the front of the lens and tall enough to cover below your cutout. I used piano hinges on the flaps so they could be adjusted to the image and for cleaning of the glass. The flaps are the key to keeping the light from reaching the glass. Third, on the small glass window that opens to the auditorium, I added a "flip up" flap using 1/4 material for viewing the screen during operating hours. We turned on the (4ft 4-bulb) fluorescent lights and now Russ Kress (member of this forum) needs to wear sun glasses in the booth with no leakage into the auditorium. This will also help a little if you are experiencing sound leaking thru your windows. There are a lot of different size port windows being sold today, but this could be adapted to work with most windows. Hope this can help someone. Does anybody else have any solutions to this problem? Lets hear from you!
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 08-03-2000 01:46 PM
The reason red lights are used in the military for nightime operations is that red light does not desensitize the rods of the eye. When exposed to white light, or light that is not red, your sensitive rod-based "night vision" is temporarily overwhelmed by the brighter light, and it takes several minutes to reaccomodate to low level light like moonlight or starlight. Red light does not have this effect. If you are a stargazer or astronomer, use red light (like a red LED flashlight) to read or adjust things at night, and you will keep your "night vision". In a paper on laboratory darkroom lighting I wrote several years ago, I recommended that hallways, locker rooms and break rooms in labs be lit with red light, so workers could return to the darkrooms without waiting for their "night vision" to return. ------------------ John P. Pytlak, Senior Technical Specialist Worldwide Technical Services, Entertainment Imaging Eastman Kodak Company Research Labs, Building 69, Room 7419 Rochester, New York, 14650-1922 USA Tel: 716-477-5325 Fax: 716-722-7243 E-Mail: john.pytlak@kodak.com
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