Paper E–7: The Printing of Underexposed Photographs by Means of “Optical Contrasters”

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: orig-research
Abstract: “Optical Contrasters” are instruments which are particularly intended for the viewing or printing of very much underexposed photographic films or plates. The principle of these special photographic enlargers is that the light shall pass several times through the film, so that the contrast is approximately multiplied by the number of passages effected. In the Type A Contraster, the film is placed between two semireflecting plates, which are mounted at a very small angle to each other, and is illuminated by collimated light. The emerging light consists of beams which have passed the film one, three, five, or more times. The direction of each beam differs slightly from the others, so that it is possible to choose any one of the beams. In the Type B Contraster, the film image is re-formed on itself by means of an objective-mirror system. Several printing tests prove the efficiency of these instruments, which may lead to a systematic improvement of the performance of cameras or the utilization of accidentally underexposed negatives.
Publication Date: 1962-01-01
DOI: 10.5594/J18115XY
Link: https://doi.org/10.5594/J18115XY
Author(s): Michel Cloupeau

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Michel Cloupeau; Paper E–7: The Printing of Underexposed Photographs by Means of “Optical Contrasters”, Journal of the SMPTE ( Volume: 71, Issue: 1A, 1962); SMPTE, 1962. Available at https://doi.org/10.5594/J18115XY

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Michel Cloupeau; Paper E–7: The Printing of Underexposed Photographs by Means of “Optical Contrasters”, Journal of the SMPTE ( Volume: 71, Issue: 1A, 1962); SMPTE, 1962. Available at https://doi.org/10.5594/J18115XY

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<span class="citation">Michel Cloupeau; <cite>Paper E–7: The Printing of Underexposed Photographs by Means of “Optical Contrasters”</cite>, Journal of the SMPTE ( Volume: 71, Issue: 1A, 1962); SMPTE, 1962. Available at <a href="https://doi.org/10.5594/J18115XY" target="_blank" rel="noopener">https://doi.org/10.5594/J18115XY</a></span>

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Michel Cloupeau; Paper E–7: The Printing of Underexposed Photographs by Means of “Optical Contrasters”, Journal of the SMPTE ( Volume: 71, Issue: 1A, 1962); SMPTE, 1962
doi: 10.5594/J18115XY
url: https://doi.org/10.5594/J18115XY

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<li>
Michel Cloupeau; <cite id="bib-10-5594-j18115xy">Paper E–7: The Printing of Underexposed Photographs by Means of “Optical Contrasters”</cite>, Journal of the SMPTE ( Volume: 71, Issue: 1A, 1962); SMPTE, 1962
<span class="doi">10.5594/J18115XY</span>
</li>