Journal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 3, September 1930)

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A Proposed New Series of Standard Focal Lengths for Motion Picture Projection Objectives

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 15, No. 3, pp. 277–280
Abstract: In the early days of motion pictures, projection objectives were supplied in a series of focal lengths which differed from each other by only an eighth of an inch. The burden of making and carrying in stock so great a variety of focal lengths became oppressive for both the manufacturer and the dealer and, in consequence, the Society at its Chicago meeting in 1917<sup>1</sup> adopted as standard a series of focal lengths in which the interval between numbers was a quarter of an inch. This practice has been followed up to the present day. The only further attention given by the Society to the subject of projection lens focal lengths consisted in adopting a standard permissible tolerance of plus or minus 1 per cent.<sup>2</sup>
Publication Date: 1930-09-01
DOI: 10.5594/J06543
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J06543
Author(s): Wilbur B. Rayton
Copyright: © 1930 Society of Motion Picture and Television Engineers, Inc.

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Wilbur B. Rayton; A Proposed New Series of Standard Focal Lengths for Motion Picture Projection Objectives, Journal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 3, September 1930); SMPTE, 1930. Available at https://doi.org/10.5594/J06543

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Wilbur B. Rayton; A Proposed New Series of Standard Focal Lengths for Motion Picture Projection Objectives, Journal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 3, September 1930); SMPTE, 1930. Available at https://doi.org/10.5594/J06543

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<span class="citation">Wilbur B. Rayton; <cite>A Proposed New Series of Standard Focal Lengths for Motion Picture Projection Objectives</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 3, September 1930); SMPTE, 1930. Available at <a href="https://doi.org/10.5594/J06543" target="_blank" rel="noopener">https://doi.org/10.5594/J06543</a></span>

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<li>
Wilbur B. Rayton; <cite id="bib-10-5594-j06543">A Proposed New Series of Standard Focal Lengths for Motion Picture Projection Objectives</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 15, Issue: 3, September 1930); SMPTE, 1930
<span class="doi">10.5594/J06543</span>
</li>