Dichroic Safelights

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: The majority of laboratories handling color positive films use a filter in their printing and processing areas which has a bandwidth that overlaps areas of high emulsion sensitivity; therefore, the light intensity must be kept low. Some laboratories have tried sodium vapor lamps, with filters to absorb unwanted side radiation. These provide high-intensity monochromatic light at wavelengths where the film has low light sensitivity. Unfortunately, this type of lamp has a high initial cost and a relatively high maintenance cost, making it impractical. A special fixture using a dichroic filter and a prefocused lamp has been designed. The output of this lamp successfully matches the filtered sodium vapor lamp and provides the illumination in a more efficient method requiring lower initial cost and considerably lower maintenance expense.
Publication Date: 1967-01-01
DOI: 10.5594/J09206
Link: https://doi.org/10.5594/J09206
Author(s): David J. Degenkolb, Jack P. Hall

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David J. Degenkolb and Jack P. Hall; Dichroic Safelights, Journal of the SMPTE ( Volume: 76, Issue: 1, January 1967); SMPTE, 1967. Available at https://doi.org/10.5594/J09206

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David J. Degenkolb and Jack P. Hall; Dichroic Safelights, Journal of the SMPTE ( Volume: 76, Issue: 1, January 1967); SMPTE, 1967. Available at https://doi.org/10.5594/J09206

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David J. Degenkolb and Jack P. Hall; Dichroic Safelights, Journal of the SMPTE ( Volume: 76, Issue: 1, January 1967); SMPTE, 1967. Available at https://doi.org/10.5594/J09206

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<span class="citation">David J. Degenkolb and Jack P. Hall; <cite>Dichroic Safelights</cite>, Journal of the SMPTE ( Volume: 76, Issue: 1, January 1967); SMPTE, 1967. Available at <a href="https://doi.org/10.5594/J09206" target="_blank" rel="noopener">https://doi.org/10.5594/J09206</a></span>

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David J. Degenkolb and Jack P. Hall; Dichroic Safelights, Journal of the SMPTE ( Volume: 76, Issue: 1, January 1967); SMPTE, 1967
doi: 10.5594/J09206
url: https://doi.org/10.5594/J09206

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David J. Degenkolb and Jack P. Hall; <cite id="bib-10-5594-j09206">Dichroic Safelights</cite>, Journal of the SMPTE ( Volume: 76, Issue: 1, January 1967); SMPTE, 1967
<span class="doi">10.5594/J09206</span>
</li>