Transactions of the Society of Motion Picture Engineers ( Volume: 12, Issue: 33, April 1928)

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Artificial Sunlight for Photographic Sensitometry

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Photographic sensitometry was first put on a scientific basis by Hurter and Driffield (J. Soc. Chem. Ind., 9: pp.455-469) in 1890 with their classic paper, Photo-chemical Investigations and a New Method of Determination of the Sensitiveness of Photographic Plates. Hurter and Driffield used a sperm candle (the British standard of candle-power at that time) for their illumination. While many improvements have been made in their sensitometric procedure, a satisfactory standard quality of illumination has not yet been generally adopted. In both research and the testing of light sensitive materials, particularly those used for negatives, light sources having relatively low color temperatures (such as the candle, acetylene flame, or Mazda B or C lamp) will not give data consistent with actual practice. Different types of photographic emulsions (ordinary, orthochromatic, and panchromatic) have widely different spectral sensitiveness, and relative speeds determined by the use of unfiltered artificial illuminants will be radically different from the relative speeds under sunlight, to which the great majority of photographic negative materials are exposed. The problem has been thoroughly considered in a report on “The Unit of Photographic Intensity” (Special Committee, Optical Society of America, L. A. Jones, Chairman, J.O.S.A. & R.S.I., 12: pp. 567–586; June, 1926).
Publication Date: 1928-04-01
DOI: 10.5594/J08117
Link: https://doi.org/10.5594/J08117
Author(s): Raymond Davis, K. S. Gibson

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Raymond Davis and K. S. Gibson; Artificial Sunlight for Photographic Sensitometry, Transactions of the Society of Motion Picture Engineers ( Volume: 12, Issue: 33, April 1928); SMPTE, 1928. Available at https://doi.org/10.5594/J08117

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Raymond Davis and K. S. Gibson; Artificial Sunlight for Photographic Sensitometry, Transactions of the Society of Motion Picture Engineers ( Volume: 12, Issue: 33, April 1928); SMPTE, 1928. Available at https://doi.org/10.5594/J08117

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<span class="citation">Raymond Davis and K. S. Gibson; <cite>Artificial Sunlight for Photographic Sensitometry</cite>, Transactions of the Society of Motion Picture Engineers ( Volume: 12, Issue: 33, April 1928); SMPTE, 1928. Available at <a href="https://doi.org/10.5594/J08117" target="_blank" rel="noopener">https://doi.org/10.5594/J08117</a></span>

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<li>
Raymond Davis and K. S. Gibson; <cite id="bib-10-5594-j08117">Artificial Sunlight for Photographic Sensitometry</cite>, Transactions of the Society of Motion Picture Engineers ( Volume: 12, Issue: 33, April 1928); SMPTE, 1928
<span class="doi">10.5594/J08117</span>
</li>