Transactions of the Society of Motion Picture Engineers ( Volume: 6, Issue: 14, May 1922)

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Negative Test Method as an Aid in Condenser Design

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: A new method is outlined for testing the performance of a projecting system including light sources, condensing, and projecting lenses. The usual conditions are reversed, the light source being replaced by a dark target possessing identical dimensions and surrounded by a lighted area. Under such conditions perfection of adjustment is indicated by a uniformly dark screen. Any departure from correct adjustment is indicated by the presence of light patches. A new two lens condensing system is described which gives a gain of approximately 60 per cent in the screen brightness. The effect upon screen brightness of various factors such as spherical aberration in the condensing lens and lack of correct adjustment of the component parts of the system is discussed.
Publication Date: 1922-05-01
DOI: 10.5594/J12455
Link: https://doi.org/10.5594/J12455
Author(s): J. T. Beechlyn

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J. T. Beechlyn; Negative Test Method as an Aid in Condenser Design, Transactions of the Society of Motion Picture Engineers ( Volume: 6, Issue: 14, May 1922); SMPTE, 1922. Available at https://doi.org/10.5594/J12455

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J. T. Beechlyn; Negative Test Method as an Aid in Condenser Design, Transactions of the Society of Motion Picture Engineers ( Volume: 6, Issue: 14, May 1922); SMPTE, 1922. Available at https://doi.org/10.5594/J12455

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<span class="citation">J. T. Beechlyn; <cite>Negative Test Method as an Aid in Condenser Design</cite>, Transactions of the Society of Motion Picture Engineers ( Volume: 6, Issue: 14, May 1922); SMPTE, 1922. Available at <a href="https://doi.org/10.5594/J12455" target="_blank" rel="noopener">https://doi.org/10.5594/J12455</a></span>

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J. T. Beechlyn; Negative Test Method as an Aid in Condenser Design, Transactions of the Society of Motion Picture Engineers ( Volume: 6, Issue: 14, May 1922); SMPTE, 1922
doi: 10.5594/J12455
url: https://doi.org/10.5594/J12455

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<li>
J. T. Beechlyn; <cite id="bib-10-5594-j12455">Negative Test Method as an Aid in Condenser Design</cite>, Transactions of the Society of Motion Picture Engineers ( Volume: 6, Issue: 14, May 1922); SMPTE, 1922
<span class="doi">10.5594/J12455</span>
</li>