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Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 6, December 1946)
[ACTIVE]

Zoom Lens for Motion Picture Cameras with Single-Barrel Linear Movement

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
Previous varifocal lenses used two or three movable components which had to be shifted against each other. This movement was necessarily nonlinear and therefore had to be achieved by nonlinear cams. This presented many mechanical difficulties and it was nearly impossible to obtain an accurately focused image over the entire range. In addition, the shifting of the movable components against each other caused numerous aberrations. The new varifocal lens has only one movable barrel, and the compensation of the image movement is achieved solely by optical, and not by mechanical means. Therefore, the lens gives a well-focused image sufficiently free from aberrations at all positions.
Publication Date
1946-12-01
DOI
10.5594/J12747
Link
https://doi.org/10.5594/J12747
Author(s)
Frank G. Back
Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J12747.json

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Frank G. Back; Zoom Lens for Motion Picture Cameras with Single-Barrel Linear Movement, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 6, December 1946); SMPTE, 1946. Available at https://doi.org/10.5594/J12747
Snippet:
Frank G. Back; Zoom Lens for Motion Picture Cameras with Single-Barrel Linear Movement, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 6, December 1946); SMPTE, 1946. Available at https://doi.org/10.5594/J12747

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Preview:
Frank G. Back; Zoom Lens for Motion Picture Cameras with Single-Barrel Linear Movement, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 6, December 1946); SMPTE, 1946. Available at https://doi.org/10.5594/J12747
Snippet:
<span class="citation">Frank G. Back; <cite>Zoom Lens for Motion Picture Cameras with Single-Barrel Linear Movement</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 6, December 1946); SMPTE, 1946. Available at <a href="https://doi.org/10.5594/J12747" target="_blank" rel="noopener">https://doi.org/10.5594/J12747</a></span>

SMPTE Icon SMPTE's HTML Pub

Preview:
Frank G. Back; Zoom Lens for Motion Picture Cameras with Single-Barrel Linear Movement, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 6, December 1946); SMPTE, 1946
doi: 10.5594/J12747
url: https://doi.org/10.5594/J12747
Snippet:
<li>
Frank G. Back; <cite id="bib-10-5594-j12747">Zoom Lens for Motion Picture Cameras with Single-Barrel Linear Movement</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 47, Issue: 6, December 1946); SMPTE, 1946
<span class="doi">10.5594/J12747</span>
</li>