Transactions of the Society of Motion Picture Engineers ( Volume: 2, Issue: 7, November 1918)

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The Function of the Condenser in the Projection Apparatus

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Light radiates from every point of a source in all directions. If we had a very intense, and at the same time cold, point-shaped source, projection would be possible without any additional optical apparatus. Supposing we have such a source s separated by the distance d from a stencil t and at a distance D from the projection screen, the size of the image on the screen would be <tex>$\frac{\mathrm{D}}{\mathrm{d}}$</tex> times the actual size of the Stencil or, differently expressed, the magnification <tex>$\mathrm{M}+\mathrm{M}=\frac{\mathrm{D}}{\mathrm{d}}$</tex>. The magnification may be changed in two ways: (a) By keeping the projection distance D constant and varying the distance between source and stencil. (b) By keeping the distance d the same and varying the projection distance.
Publication Date: 1918-11-01
DOI: 10.5594/J17996
Link: https://doi.org/10.5594/J17996
Author(s): Hermann Kellner

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Hermann Kellner; The Function of the Condenser in the Projection Apparatus, Transactions of the Society of Motion Picture Engineers ( Volume: 2, Issue: 7, November 1918); SMPTE, 1918. Available at https://doi.org/10.5594/J17996

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Hermann Kellner; The Function of the Condenser in the Projection Apparatus, Transactions of the Society of Motion Picture Engineers ( Volume: 2, Issue: 7, November 1918); SMPTE, 1918. Available at https://doi.org/10.5594/J17996

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<span class="citation">Hermann Kellner; <cite>The Function of the Condenser in the Projection Apparatus</cite>, Transactions of the Society of Motion Picture Engineers ( Volume: 2, Issue: 7, November 1918); SMPTE, 1918. Available at <a href="https://doi.org/10.5594/J17996" target="_blank" rel="noopener">https://doi.org/10.5594/J17996</a></span>

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<li>
Hermann Kellner; <cite id="bib-10-5594-j17996">The Function of the Condenser in the Projection Apparatus</cite>, Transactions of the Society of Motion Picture Engineers ( Volume: 2, Issue: 7, November 1918); SMPTE, 1918
<span class="doi">10.5594/J17996</span>
</li>