Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 2, August 1946)

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The Photometric Calibration of Lens Apertures

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 47, No. 2, pp. 142–151
Abstract: An absolute and physically sound method developed at Bausch & Lomb is described for the photometric calibration of lens apertures. Essentially the method consists in comparing the total flux from a depolished opal glass aperture with the flux through a given lens at a definite stop opening when focused on the opal glass aperture. An integrating sphere is used to collect the flux in the two cases and readings are made proportional to the flux with two matched barrier layer photocells. The theoretical development and some numerical results are given.
Publication Date: 1946-08-01
DOI: 10.5594/J12796
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J12796
Author(s): Allen E. Murray
Copyright: © 1946 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

Stop Calibration of Photographic Objectives [Active]
Twentieth Century Camera and Accessories [Active]
A Lens Calibrating System [Active]
A System of Lens Stop Calibration by Transmission [Active]
1 Pestrecov K. : Private communication ( 1945 ). EXTERNAL
5 The term “transmittance” is used for the ratio of the light transmitted to the light incident in accordance with the Optical Society of America Committee on Colorimetry Report, J. Opt. Soc. Amer. , 34 , 4 (Apr. 1944 ), p. 184 . EXTERNAL
6 Martin L. C. : “An Introduction to Applied Optics,” Pitman & Sons , ( London ), 1932 , p. 206 . EXTERNAL
7 Hardy A. C. Perrin F. H. : “The Principles of Optics,” McGraw-Hill Book Co. , ( New York ), 1932 , p. 272 . EXTERNAL
8 Walsh S. W. T. : “Photometry,” Constable ( London ), 1926 , p. 102 . EXTERNAL
9 As here used, a fractional stop is understood to mean the ratio given by the fractional power of √2, the ratio between two geometrical full stops; e. g. , ½-stop difference corresponds to the ratio 2¼ between the fractional stops, stop , etc. . EXTERNAL

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Allen E. Murray; The Photometric Calibration of Lens Apertures, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 2, August 1946); SMPTE, 1946. Available at https://doi.org/10.5594/J12796

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Allen E. Murray; The Photometric Calibration of Lens Apertures, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 2, August 1946); SMPTE, 1946. Available at https://doi.org/10.5594/J12796

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<span class="citation">Allen E. Murray; <cite>The Photometric Calibration of Lens Apertures</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 2, August 1946); SMPTE, 1946. Available at <a href="https://doi.org/10.5594/J12796" target="_blank" rel="noopener">https://doi.org/10.5594/J12796</a></span>

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Allen E. Murray; The Photometric Calibration of Lens Apertures, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 2, August 1946); SMPTE, 1946
doi: 10.5594/J12796
url: https://doi.org/10.5594/J12796

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<li>
Allen E. Murray; <cite id="bib-10-5594-j12796">The Photometric Calibration of Lens Apertures</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 2, August 1946); SMPTE, 1946
<span class="doi">10.5594/J12796</span>
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Referenced By

Standards and Recommended Practices [Active]
Errors in Calibration of the f Number [Active]
Report of Lens-Calibration Subcommittee [Active]