A Three-Element Projector Condensing System

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: The design of an efficient optical condensing system is difficult to achieve, since a high aperture must be provided at the source, while an enlarged image of the source is required at the entrance pupil of the projection lens. The system outlined consists of three basic elements, together with a series of supplementary lenses to accommodate a range of projection lenses from 35 to 300 mm. Besides the requirement for high initial aperture, two additional goals were set: correction for the cosine falloff at the source; and compatibility with all projection lenses in a specified range of f-numbers. These two latter objectives were attained using a field flatness of 10% and an f/2.5 lens which received 90% of the flux at its entrance pupil. These conditions are based on a 50 ° acceptance angle at the filament of a 1200-W incandescent projection lamp.
Publication Date: 1970-02-01
DOI: 10.5594/J10734
Link: https://doi.org/10.5594/J10734
Author(s): Chan Street

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Chan Street; A Three-Element Projector Condensing System, Journal of the SMPTE ( Volume: 79, Issue: 2, February 1970); SMPTE, 1970. Available at https://doi.org/10.5594/J10734

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Chan Street; A Three-Element Projector Condensing System, Journal of the SMPTE ( Volume: 79, Issue: 2, February 1970); SMPTE, 1970. Available at https://doi.org/10.5594/J10734

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Chan Street; A Three-Element Projector Condensing System, Journal of the SMPTE ( Volume: 79, Issue: 2, February 1970); SMPTE, 1970. Available at https://doi.org/10.5594/J10734

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<span class="citation">Chan Street; <cite>A Three-Element Projector Condensing System</cite>, Journal of the SMPTE ( Volume: 79, Issue: 2, February 1970); SMPTE, 1970. Available at <a href="https://doi.org/10.5594/J10734" target="_blank" rel="noopener">https://doi.org/10.5594/J10734</a></span>

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Preview:

Chan Street; A Three-Element Projector Condensing System, Journal of the SMPTE ( Volume: 79, Issue: 2, February 1970); SMPTE, 1970
doi: 10.5594/J10734
url: https://doi.org/10.5594/J10734

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Chan Street; <cite id="bib-10-5594-j10734">A Three-Element Projector Condensing System</cite>, Journal of the SMPTE ( Volume: 79, Issue: 2, February 1970); SMPTE, 1970
<span class="doi">10.5594/J10734</span>
</li>