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Author
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Topic: Port glass Problem need help
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Brooks M. Davies
Film Handler
Posts: 28
From: Killeen, TX, USA
Registered: Jul 2002
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posted 07-13-2002 02:39 AM
My question is about cleaning the port glass, our 14 plex has a tint on our port glass, yes tint, pretty dark too, anyway when cleaning the glass it leaves streaks. I have tried every glass cleaning method i have ever heard of in reducing the streaks, yet still they are there. It registers fine on the light meter, even with the streaks, and im not sure if it can be see on screen, I cant anyway, but has anyone seen this or dealt with the "tint that cant be clean"? ive tried all the port glass cleaners there are and windex, vinegar you name it any secret potions out there??
thanksits the glass that is tinted not a stuck on tint just thought id throw that in.
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Paul G. Thompson
The Weenie Man
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 07-13-2002 07:41 PM
I would guess the tint is the coating to increase the efficiency of light passing through it, just like a projection lens.Ammonia works well, but your nose might not like it. However, I don't know if it will damage the coating. I have seen someone really saturate the window with rubbing alcohol and wiped it down with soft lint-free towels. Again, then the window was generously re-saturated and a squeegee was used to finish the job. I was amazed with the results.
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Frank Angel
Film God
Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999
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posted 07-16-2002 01:03 AM
Darkly TINTED port glass? Or is that - Through a Tinted Port Glass Darkly? I am with Steve on this -- the proper way of dealing with tinted port glass is the same as what you do with dead Xenon bulbs. You take the port glass out carefully, wrap it in heavy newspaper and place it in a heavy duty plastic bag, put it in a garbage pail and smash it with a hammer. And THAT's what you do with tinted port glass. Seriously....when you look THROUGH it, does it look tinted? A coating like you find on a lens is deceptive -- the color that you see while looking AT the lens surface is the coating affecting the light bouncing off it -- when you look THROUGH the lens, you don't see any color at all -- it becomes obvious that the lens glass has no tint and is clear. If you look through the port glass and you see that the screen looks anything but pure white, then take the steps outlined above. Frank
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Brooks M. Davies
Film Handler
Posts: 28
From: Killeen, TX, USA
Registered: Jul 2002
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posted 07-17-2002 03:52 AM
ok to answer the questions yall had, its not a surface tint its tinted glass and it is def. tinted. looking out into the auditorium with the overhead cleaning lights on, you can def. tell. kinda like a car window tint yet not stuck on, i dont think its a reflective coating as we can see the picture on the port glass and it reflects back in to the booth, and you can even watch some of it off that wall, the theater is a "hollywood" wallace 14 all staduim seating about 3 years old, yes only 3 years old ,when put up to the meter it registers ok just dont understand the tint myself and its a bear to clean, but the mcdonalds tip from brad works pretty well. yes im stumped......
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 07-17-2002 12:50 PM
Measure the screen luminance both with the port glass in place, and then without any port glass. If the reading with the port glass is more than about 1 footlambert less than without any glass, you are losing too much light.Likewise, compare the stray light just to the side of the screen with and without the port glass. In a totally darkened theatre, briefly project "open gate" white light on the screen, and observe the amount of stray light that can be seen on a white piece of cardboard held near the screen, just outside the projected beam. Remove the port glass, and see how much less stray light there is. (Don't project "open gate" more than a few seconds at a time, to avoid damaging the lens with excessive heating). Anti-reflection coatings on clear optical-quality glass are well worth the additional expense compared to plain glass.
http://www.kodak.com/US/en/motion/newsletters/pytlak/dec99.shtml ------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
e-mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
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. Also, it is increased security against booth-jackings. 
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