Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 1, January 1942)

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The Ir System: An Optical Method for Increasing Depth of Field

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: The depth of field of a corrected lens system is determined by its focal length, its relative aperture, and the permissible diameter of the “in-focus” image of a point source. The limited depth of field in motion picture photography restricts freedom of action in large parts of the set, dictates a stylized, protracted, and costly studio procedure, and affects the dramatic value and audience appeal of monochrome or color pictures. Previous attempts to increase lens depth of field have been scientifically unsound and unsuccessful in practice. The new IR System, described in this paper, is based on a division of the set into optically appropriate regions, each region having identifiable illumination, with the identification and differential focusing at the camera of all regional images within a single exposure. Thus greatly increased depth of field in straight and process shots becomes available. By a further modification in regional lighting, a number of such increased-depth takes can be simultaneously made from different distances or at various angles, each such take having its own different and appropriate lighting.
Publication Date: 1942-01-01
DOI: 10.5594/J09934
Link: https://doi.org/10.5594/J09934
Author(s): Alfred N. Goldsmith

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Alfred N. Goldsmith; The Ir System: An Optical Method for Increasing Depth of Field, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 1, January 1942); SMPTE, 1942. Available at https://doi.org/10.5594/J09934

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Alfred N. Goldsmith; The Ir System: An Optical Method for Increasing Depth of Field, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 1, January 1942); SMPTE, 1942. Available at https://doi.org/10.5594/J09934

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<span class="citation">Alfred N. Goldsmith; <cite>The Ir System: An Optical Method for Increasing Depth of Field</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 1, January 1942); SMPTE, 1942. Available at <a href="https://doi.org/10.5594/J09934" target="_blank" rel="noopener">https://doi.org/10.5594/J09934</a></span>

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<li>
Alfred N. Goldsmith; <cite id="bib-10-5594-j09934">The Ir System: An Optical Method for Increasing Depth of Field</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 38, Issue: 1, January 1942); SMPTE, 1942
<span class="doi">10.5594/J09934</span>
</li>