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Journal of the Society of Motion Picture and Television Engineers ( Volume: 57, Issue: 2, August 1951)
[ACTIVE]

Modified Negative Perforation

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
The existence of two or more perforation shapes for 35-mm films has, for many years, been considered undesirable. For processes requiring accurate film positioning, the dual Standard of Negative perforation for camera stock and Positive perforation for release stock does not suffice. Registration problems are minimized if Negative perforations are used throughout; experience, however, has shown that projection life is short. The Modified Negative perforation, with fillets at the corners, has improved resistance to tear while preserving the general negative form corresponding to conventional piloting means. Tests conducted show that better film positioning is accomplished in conventional camera and printing equipment for film with Modified Negative perforations than for film with Dubray-Howell perforations. The method of evaluating film location during exposure and printing is described and evidence of results presented. Photoelectrically recorded charts show the extent of out-of-register which resulted for various combinations of perforation types. Film-life projection tests indicate that the Modified Negative perforation is equal or superior to the Dubray-Howell perforation.
Publication Date
1951-08-01
DOI
10.5594/J05054
Link
https://doi.org/10.5594/J05054
Author(s)
W. G. Hill
Source Data (JSON)

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W. G. Hill; Modified Negative Perforation, Journal of the Society of Motion Picture and Television Engineers ( Volume: 57, Issue: 2, August 1951); SMPTE, 1951. Available at https://doi.org/10.5594/J05054
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W. G. Hill; Modified Negative Perforation, Journal of the Society of Motion Picture and Television Engineers ( Volume: 57, Issue: 2, August 1951); SMPTE, 1951. Available at https://doi.org/10.5594/J05054

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W. G. Hill; Modified Negative Perforation, Journal of the Society of Motion Picture and Television Engineers ( Volume: 57, Issue: 2, August 1951); SMPTE, 1951. Available at https://doi.org/10.5594/J05054
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<span class="citation">W. G. Hill; <cite>Modified Negative Perforation</cite>, Journal of the Society of Motion Picture and Television Engineers ( Volume: 57, Issue: 2, August 1951); SMPTE, 1951. Available at <a href="https://doi.org/10.5594/J05054" target="_blank" rel="noopener">https://doi.org/10.5594/J05054</a></span>

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Preview:
W. G. Hill; Modified Negative Perforation, Journal of the Society of Motion Picture and Television Engineers ( Volume: 57, Issue: 2, August 1951); SMPTE, 1951
doi: 10.5594/J05054
url: https://doi.org/10.5594/J05054
Snippet:
<li>
W. G. Hill; <cite id="bib-10-5594-j05054">Modified Negative Perforation</cite>, Journal of the Society of Motion Picture and Television Engineers ( Volume: 57, Issue: 2, August 1951); SMPTE, 1951
<span class="doi">10.5594/J05054</span>
</li>