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Author
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Topic: sound up or down on platter?
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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 06-21-2002 10:47 AM
In most cases with today's polyester prints, emulsion-out (track up) on a platter seems to work better. But the optimum orientation depends upon the curl of the film, which is dependent upon the drying conditions of the print, and the relative humidity in the projection room. So if you are having problems with one orientation (e.g., more "static cling"), try the other. Optimum humidity range is 50 to 60 percent RH.Confusion may exist because of SMPTE Recommended Practice RP39 which recommends maintaining an "emulsion-in" orientation for optimum focus stability. But SMPTE RP39 is based on triacetate film, wound on small hub cores and reels. ------------------ 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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Manny Knowles
"What are these things and WHY are they BLUE???"
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Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002
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posted 06-21-2002 05:23 PM
Sometimes running the film track down for ONE showing will help reduce static. Don't ask me why.Sometimes you have to run the film track down for ONE showing to FilmGuard the other edge...if you're still using PTR's like I am you cannot apply FilmGuard to the whole print area. All other times I run with the track up. Long ago, I used to think that this was to prevent damaging the soundtrack if the rollers happen to be misaligned (dragging on platter with track-down would damage both picture and sound).
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