Journal of the Society of Motion Picture and Television Engineers ( Volume: 56, Issue: 1, January 1951)

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Diffuse and Collimated T-Numbers: A Review and Description of New Equipment

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPTE
Volume: 56, No. 1, pp. 79–85
Abstract: The SMPTE Subcommittee on Lens Calibration has formally recognized, through incorporation in its report, two methods of lens calibration. While they reach equivalent results and will calibrate lenses identically when properly safeguarded, each has its own short comings and advantages, which are not commonly recognized. To dispel the evident misunderstandings about these two methods, they are compared and the reasons are indicated for the method chosen. New equipment designed by Bausch & Lomb Optical Co. for lens calibration based on the diffuse method is described briefly.
Publication Date: 1951-01-01
DOI: 10.5594/J05097
ISSN: Print: 0898-042X
Link: https://doi.org/10.5594/J05097
Author(s): Allen E. Murray
Copyright: © 1951 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1. “Report of the SMPTE Subcommittee on Lens Calibration,” Jour. SMPE , vol. 53 , pp. 368 – 378 , Oct. 1949 . EXTERNAL
10. Clarke D. B. Laube G. , “Twentieth Century camera and accessories,” Jour. SMPE , vol. 36 , pp. 50 – 64 , Jan. 1941 ; also U. S. Pat. 2,334,906, 1943. EXTERNAL
11. Sachtleben L. T. , “Method of calibrating lenses,” U. S. Pat. 2,419,421, 1947 . EXTERNAL
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13. Back F. G. , “A simplified method for precision calibration of effective f-stops,” Jour. SMPE , vol. 49 , pp. 122 – 130 , Aug. 1947 . EXTERNAL
14. Berlant E. , “A system of lens stop calibration by transmission,” Jour. SMPE , vol. 46 , pp. 17 – 25 , Jan. 1946 . EXTERNAL
15. Murray A. E. , “The photometric calibration of lens apertures,” Jour. SMPE , vol. 47 , pp. 142 – 151 , Aug. 1946 . EXTERNAL
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18. Kochs A. , “Lichtstärke und relative Offnung von Kine-Objectiven,” Kinotechnik , vol. 22 , pp. 154 – 157 , Nov. 1940 . EXTERNAL
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4. Townsley M. G. , “An instrument for photometric calibration of lens iris scales,” Jour. SMPE , vol. 49 , pp. 111 – 122 , Aug. 1947 . EXTERNAL
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6. Hrdlicka J. , “Measuring the effective illumination of photographic objects,” Jour. SMPE , vol. 14 , pp. 531 – 533 , May 1930 . EXTERNAL
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Allen E. Murray; Diffuse and Collimated T-Numbers: A Review and Description of New Equipment, Journal of the Society of Motion Picture and Television Engineers ( Volume: 56, Issue: 1, January 1951); SMPTE, 1951. Available at https://doi.org/10.5594/J05097

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Allen E. Murray; Diffuse and Collimated T-Numbers: A Review and Description of New Equipment, Journal of the Society of Motion Picture and Television Engineers ( Volume: 56, Issue: 1, January 1951); SMPTE, 1951. Available at https://doi.org/10.5594/J05097

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<span class="citation">Allen E. Murray; <cite>Diffuse and Collimated T-Numbers: A Review and Description of New Equipment</cite>, Journal of the Society of Motion Picture and Television Engineers ( Volume: 56, Issue: 1, January 1951); SMPTE, 1951. Available at <a href="https://doi.org/10.5594/J05097" target="_blank" rel="noopener">https://doi.org/10.5594/J05097</a></span>

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Allen E. Murray; <cite id="bib-10-5594-j05097">Diffuse and Collimated T-Numbers: A Review and Description of New Equipment</cite>, Journal of the Society of Motion Picture and Television Engineers ( Volume: 56, Issue: 1, January 1951); SMPTE, 1951
<span class="doi">10.5594/J05097</span>
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