Effect of Winding on the Projection Performance of 35mm Motion-Picture Film

By Paul Preo and Eric Yavitz

June 1965. The Journal of the Society of Motion Picture and Television Engineers.
Reproduced with permission from SMPTE.


Projection performance depends greatly upon the diameter to which the film has been wound on a reel or core prior to projection, and the effect is more obvious for film wound emulsion-out. Screen-image quality differs considerably between the head and core ends of a theater print, but if the film is kept wound emulsion-in, the focus stability is substantially improved, particularly in the larger, higher-intensity installations. These effects have been examined in a continous series of practical studies. Extrapolations are suggested from the 35mm experiments to all projection formats.

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