A Spot Exposure Meter Designed for Color Photography

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPTE
Volume: 86, No. 10, pp. 721–725
Abstract: The use of handheld spot-photometers and through-the-lens (TTL) exposure measuring devices built into professional still-photography and motion-picture cameras seems to indicate that reflected light measurement techniques tend to win out in the lively, usually friendly and often enlightening controversy1 between the supporters of incident light measurement and those in favor of reflected light measurement. An analysis of both methods of exposure determination is made. Present-day reflected-light exposure meters are not adapted to the measuring of light reflected by colored objects. They do not respond in the same way as do color-photographic materials. This discrepancy, due the use of a single spectral overall response instead of three spectrally selective responses, leads to important errors in exposure indication and scene contrast determination, especially when employing narrow-angle reflected-light spot photometers. A spot exposure meter having three light sensitive elements with responses similar to those of the three emulsion layers of a color film is described.
Publication Date: 1977-10-01
DOI: 10.5594/J06737
ISSN: Print: 0036-1682
Link: https://doi.org/10.5594/J06737
Author(s): K. StaesAgfa-Gevaert N.V., R & D Laboratories, Septestraat 27, Mortsel B-2510, Belgium.
Copyright: © 1977 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

Exposure Control [Active]
Electrical Design Concepts of Exposure Meters with Special Reference to the Ikophot T [Active]
The K-Rating System, a Reliable Exposure Determination System Using a Spot Exposure Meter [Active]
Letter to the Editor: An Exposure-Control Myth [Active]
An Evaluation of Certain Techniques of using Exposure Meters [Active]
1. Askowith Burton J. , “Reflectance Meter with Exposure-Control Advantages of Incident-Light Meter,” J. SMPTE , 74 : 590 – 591 , July 1965 . EXTERNAL
10. Woodbury W. , “Two Psychophysical Methods for Evaluating the Quality of Projected Color Slides,” Phot. Sci. and Engrg. , 4 : 69 , 1960 . EXTERNAL
14. Ehrenfried George , “Letter to the Editor: Re: Exposure Measurement by Incident Light,” J. SMPTE , 64 : 390 , July 1955 . EXTERNAL
16. Harris James W. , “Exposure Control and Stray-Light Component,” J. SMPTE , 74 : 587 – 589 , July 1965 . EXTERNAL
17. Albrecht P. , “Das Color-Spot-Photometer, ein universelles Messgerät für Farbstudios,” Rund. Tech. Mitt. , 14 : 85 , 1970 . EXTERNAL
18. Field Harold P. , “Spot Photometers in Exposure Control,” J. SMPTE , 74 : 592 – 593 , July 1965 . EXTERNAL
2. Jones L. A. Condit H. R. , “Sunlight and Skylight as Determinants of Photographic Exposure,” J. Opt. Soc. Amer. , 38 : 123 , 1948 . EXTERNAL
20. British Patent 1.271.505; U.S. Patent 3,748,981; and Brev. d. Inv. 2.013.464. “Method and Apparatus for Determining the Exposure of a Recording Material,” K. Staes and Y. Natens. EXTERNAL
21. ANSI Standard PH3.37-1969, “Test Method for the Selective Transmission of a Photographic Lens.” . EXTERNAL
3. ANSI Standard PH3.49-1971, “General Purpose Photographic Exposure Meters (Photoelectric Type).” Also DIN 19010/2 ( 1972 ) and BSI 1383 ( 1966 ) and ISO 2720. EXTERNAL
4. ANSI Standard PH2.5-1972, “Method of Determining Speed of Photographic Negative Materials (Monochrome, Continuous-Tone).” Also DIN 4512/1 ( 1971 ) and BSI 1380/1 ( 1962 ) and ISO 6. EXTERNAL
5. ANSI Standard PH2.21-1972, “Sensitometric Exposure and Evaluation Method for Determining Speed of Color Reversal Film for Still Photography,” Also DIN 4512/4 ( 1968 ) and BSI 1380/2 ( 1963 ) and ISO 2240 ( 1972 ). EXTERNAL
6. ANSI Standard PH2.27-1965, “Method of Determining the Speed of Color Negative Films for Still Photography.” . EXTERNAL
7. ANSI Standard PH22.146-1973, “Method for Determining Speed of 16mm, 8mm, and Super 8 Reversal Color Camera Films Intended for Direct Projection in Motion Picture Photography, (including PH2.21-1972).” . EXTERNAL
8. Bartleson C. J. , “Interrelations among Screen Luminance, Camera Exposure and Quality of Projected Color Transparencies,” Phot. Sci. and Engrg. , 9 : 174 , 1965 . EXTERNAL
9. Albro J. R. Current I. B. , “Speed Rating of Reversible Color Films,” Phot. Sci. and Engrg. , 4 : 65 , 1960 . EXTERNAL

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K. Staes; A Spot Exposure Meter Designed for Color Photography, SMPTE Journal ( Volume: 86, Issue: 10, October 1977); SMPTE, 1977. Available at https://doi.org/10.5594/J06737

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K. Staes; A Spot Exposure Meter Designed for Color Photography, SMPTE Journal ( Volume: 86, Issue: 10, October 1977); SMPTE, 1977. Available at https://doi.org/10.5594/J06737

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K. Staes; A Spot Exposure Meter Designed for Color Photography, SMPTE Journal ( Volume: 86, Issue: 10, October 1977); SMPTE, 1977. Available at https://doi.org/10.5594/J06737

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<span class="citation">K. Staes; <cite>A Spot Exposure Meter Designed for Color Photography</cite>, SMPTE Journal ( Volume: 86, Issue: 10, October 1977); SMPTE, 1977. Available at <a href="https://doi.org/10.5594/J06737" target="_blank" rel="noopener">https://doi.org/10.5594/J06737</a></span>

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K. Staes; A Spot Exposure Meter Designed for Color Photography, SMPTE Journal ( Volume: 86, Issue: 10, October 1977); SMPTE, 1977
doi: 10.5594/J06737
url: https://doi.org/10.5594/J06737

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K. Staes; <cite id="bib-10-5594-j06737">A Spot Exposure Meter Designed for Color Photography</cite>, SMPTE Journal ( Volume: 86, Issue: 10, October 1977); SMPTE, 1977
<span class="doi">10.5594/J06737</span>
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