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Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 2, August 1947)
[ACTIVE]

A Simplified Method for Precision Calibration of Effective f Stops

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
Many methods have been proposed to replace the geometrical f ratio by an effective calibration which takes the transmittance of the lens into consideration, but no method proposed so far has been accepted. The author outlines a new method of photoelectric lens calibration using the null method which compares the lens to be calibrated to a standard lens. This standard can be easily reproduced with a very high uniformity of performance. The method has been tested very thoroughly and is now in practical use for lens calibration. The accuracy obtained with this method is far superior to any procedure used so far. Its simplicity enables even an unskilled operator to obtain accurate results combined with a high working speed.
Publication Date
1947-08-01
DOI
10.5594/J17823
Link
https://doi.org/10.5594/J17823
Author(s)
F. G. Back
Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-J17823.json

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F. G. Back; A Simplified Method for Precision Calibration of Effective f Stops, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 2, August 1947); SMPTE, 1947. Available at https://doi.org/10.5594/J17823
Snippet:
F. G. Back; A Simplified Method for Precision Calibration of Effective f Stops, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 2, August 1947); SMPTE, 1947. Available at https://doi.org/10.5594/J17823

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F. G. Back; A Simplified Method for Precision Calibration of Effective f Stops, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 2, August 1947); SMPTE, 1947. Available at https://doi.org/10.5594/J17823
Snippet:
<span class="citation">F. G. Back; <cite>A Simplified Method for Precision Calibration of Effective f Stops</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 2, August 1947); SMPTE, 1947. Available at <a href="https://doi.org/10.5594/J17823" target="_blank" rel="noopener">https://doi.org/10.5594/J17823</a></span>

SMPTE Icon SMPTE's HTML Pub

Preview:
F. G. Back; A Simplified Method for Precision Calibration of Effective f Stops, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 2, August 1947); SMPTE, 1947
doi: 10.5594/J17823
url: https://doi.org/10.5594/J17823
Snippet:
<li>
F. G. Back; <cite id="bib-10-5594-j17823">A Simplified Method for Precision Calibration of Effective f Stops</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 2, August 1947); SMPTE, 1947
<span class="doi">10.5594/J17823</span>
</li>