Improved-Strength Eastman 35mm Motion-Picture BH Perforations
Because of its fundamental shape, the 35mm BH film perforation has historically had a weakness for tearing at the corners. Recognition of this problem, through literature and consumer contact, led to the development by Eastman Kodak Co. of a modified perforation with .005-in. corner radii. Laboratory and field testing confirmed the rounded corners resulted in improved strength with no detrimental effects. Routine production has now begun, and modifications to the standards literature are in progress through the appropriate SMPTE and ISO committees.
- Print ISSN
- 0036-1682
- Published
- 1991-11
- Content type
- Original Research
- DOI
- 10.5594/J02408
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