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Author
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Topic: Loop Flash?
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Josh Jones
Redhat
Posts: 1207
From: Plano, TX
Registered: Apr 2000
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posted 08-05-2002 11:20 PM
Lately I heard of a phenomenon known as loop flash. It is supposively noticeable only at close range to the screen and studio people are bitching about it. I have also heard Kinotone projectors dont have this problem, but others do. Anyone know more about this?Josh ----------------------------------------------------------------
P.S. It can be solved by moving the picture aperture to a higher position in the gate, farther from the lower loop.
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"Film is made of silver, video is made of rust"
'nuf said
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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 08-07-2002 03:30 AM
I wonder if Josh might be referring to a "rubber screen". That's when there is image flutter near the center of the screen. I think I am using the correct term in describing this... If memory serves me correctly, I picked up that term from the Kodak's "Reel People" publication a long time ago. I have seen this occur in straight gate machines on occassion. There are multiple causes of this problem. However, I have not seen that happen in a curved gate machine.
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Bill Gabel
Film God
Posts: 3873
From: Technicolor / Postworks NY, USA
Registered: Jan 2002
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posted 08-07-2002 12:57 PM
Are you running regular release prints or work prints???What type of splices?? Because if you are running work prints, you will have different
types of splices to deal with. (inviso , 8 perf single sided splices
...) I have a pair of Magna-Tech PR-135 projectors, which are the
studio version of the Kinoton FP20 projectors.
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 08-07-2002 09:23 PM
"Focus Flutter" is a heat-related effect:
http://www.kodak.com/US/en/motion/newsletters/pytlak/fall97.shtml
http://www.kodak.com/US/en/motion/newsletters/pytlak/winter97.shtml Be sure your lamp is aligned properly, with no hot spotting, and that you are using efficient heat filtration. Adjusting gate tension can sometimes help. High film moisture levels (freshly processed prints, high humidity) can aggravate the flutter as the radiant heat of the lamp drives out moisture, causing a rapid change in curl.
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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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Paul G. Thompson
The Weenie Man
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 08-09-2002 03:50 AM
John, I am sure it was a slang. Maybe that's what it was referring to. Thank you for looking it up. I think that issue goes back to the mid 80's, maybe even earlier. It was a very popular magazine many theatres ordered specifically for a projection booth reference. It was about 3/8 of an inch thick. David, I don't know what it is called. I wonder if Josh might have been referring to what you described. Paul
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Regardless I didn't see anything to bitch about as I was standing at the screen with the RP40 running, and I am quite the anal retentive ass when it comes to projection.
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