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Journal of the SMPTE ( Volume: 77, Issue: 1, January 1968)
[ACTIVE]

Re-evaluation of Factors Affecting Manual or Automatic Control of Camera Exposure

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
J SMPTE
Volume
77, No. 1, pp. 24–26
Abstract
The sophistication of exposure controls in cameras has demanded more thorough analysis of the predetermination of exposure. The film exposure level maintained by an automatic control in a camera depends primarily on the film speed but several other variables can manifest substantial influence. The effects of field-luminance distribution and spectral sensitivity, as well as the sensitometric, optical and photometric relations are expressed analytically and the equations for camera exposure are derived. The resulting constant relates the ASA standard film speed to the preferred exposure for an area in an average scene having the average luminance indicated by the meter. This constant, when combined with nine variables which are a function of camera design, meter design and scene structure, provides an equation that is simplified by substituting empirical values for all but three parameters. The exposure constant is expressed as a function of the lens transmission, spectral characteristics of the detector and the discrimination of the field luminance measurement.
Publication Date
1968-01-01
DOI
10.5594/J05868
ISSN
Print: 0361-4573
Link
https://doi.org/10.5594/J05868
Author(s)
James F. ScudderKodak Apparatus Div., Eastman Kodak Co., 400 Plymouth Ave. N., Rochester, N.Y. 14650
C. N. NelsonKodak Park, Eastman Kodak Co., Rochester, N.Y. 14650
Allen StimsonKodak Apparatus Div., Eastman Kodak Co., 400 Plymouth Ave. N., Rochester, N.Y. 14650.
Copyright
© 1968 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

  • The G-Number: A Photometric Lens-Aperture Designation [Active]
  • 1. USA Standard, Method of Determining Speed of Color Reversal Film for Still Photography, PH2.21–1961. EXTERNAL
  • 10. USA Standard, Method for Determining Aperture Calibration of Motion Picture Lenses, PH22.90–1964. EXTERNAL
  • 11. USA Standard, Automatic Exposure Controls for Cameras, PH2.15–1964. EXTERNAL
  • 12. Stimson Allen , “An interpretation of current exposure meter technology,” Phot. Sci. & Eng. , 6 : No. 1 , 1 , Jan.-Feb. 1962 . EXTERNAL
  • 2. Nelson C. N. , “Safety factors in camera exposure,” Phot. Sci. & Eng. , 4 : No. 1 , 48 – 58 , Jan.-Feb. 1960 ; also Jour. SMPTE, 69: 479–483, July 1960. EXTERNAL
  • 3. Stimson Allen , “Measuring and judging photographic exposure of color film for automatic exposure controlled cameras,” Phot. Sci. & Eng. , 4 : No. 4 , 203 , July-Aug. 1960 . EXTERNAL
  • 4. Woodbury W. , “Two psychophysical methods for evaluating the quality of projected color slides,” Phot. Sci. & Eng. , 4 : No. 2 , Mar.-Apr. 1960 . EXTERNAL
  • 6. USA Standard, Actinity or the Relative Photographic Effectiveness of Illuminants, PH2.3–1956. EXTERNAL
  • 7. USA Standard, General-Purpose Photographic Exposure Meters (Photoelectric Type), PH2.12–1961. EXTERNAL
  • 8. Mees C. E. K. James T. H. , Theory of the Photographic Process , 3d ed. , Macmillan Co. , New York , 1966 . EXTERNAL
  • 9. USA Standard, Method for Determining Photographic Speed and Exposure Index, PH2.5–1964. EXTERNAL
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James F. Scudder, C. N. Nelson, and Allen Stimson; Re-evaluation of Factors Affecting Manual or Automatic Control of Camera Exposure, Journal of the SMPTE ( Volume: 77, Issue: 1, January 1968); SMPTE, 1968. Available at https://doi.org/10.5594/J05868
Snippet:
James F. Scudder, C. N. Nelson, and Allen Stimson; Re-evaluation of Factors Affecting Manual or Automatic Control of Camera Exposure, Journal of the SMPTE ( Volume: 77, Issue: 1, January 1968); SMPTE, 1968. Available at https://doi.org/10.5594/J05868

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James F. Scudder, C. N. Nelson, and Allen Stimson; Re-evaluation of Factors Affecting Manual or Automatic Control of Camera Exposure, Journal of the SMPTE ( Volume: 77, Issue: 1, January 1968); SMPTE, 1968. Available at https://doi.org/10.5594/J05868
Snippet:
<span class="citation">James F. Scudder, C. N. Nelson, and Allen Stimson; <cite>Re-evaluation of Factors Affecting Manual or Automatic Control of Camera Exposure</cite>, Journal of the SMPTE ( Volume: 77, Issue: 1, January 1968); SMPTE, 1968. Available at <a href="https://doi.org/10.5594/J05868" target="_blank" rel="noopener">https://doi.org/10.5594/J05868</a></span>

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James F. Scudder, C. N. Nelson, and Allen Stimson; Re-evaluation of Factors Affecting Manual or Automatic Control of Camera Exposure, Journal of the SMPTE ( Volume: 77, Issue: 1, January 1968); SMPTE, 1968
doi: 10.5594/J05868
url: https://doi.org/10.5594/J05868
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<li>
James F. Scudder, C. N. Nelson, and Allen Stimson; <cite id="bib-10-5594-j05868">Re-evaluation of Factors Affecting Manual or Automatic Control of Camera Exposure</cite>, Journal of the SMPTE ( Volume: 77, Issue: 1, January 1968); SMPTE, 1968
<span class="doi">10.5594/J05868</span>
</li>

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