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Journal of the Society of Motion Picture Engineers ( Volume: 19, Issue: 4, October 1932)
[ACTIVE]

The Bell & Howell Cooke Varo Lens

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
J SMPE
Volume
19, No. 4, pp. 329–339
Abstract
A variable focus, variable magnification lens of new and outstanding design is described. The Varo is a “zoom” type lens, introducing the conception of a variable three-element system in place of the two-element variable telephoto system previously used for this type of work. A summary of the optical problems involved is presented, and a description of the lens showing how the mechanical design has been fitted to the optical specifications is given, together with a discussion of the relation of the rate of “zoom” to the loss of definition. The paper closes with a brief outline of the use of the lens in practice.
Publication Date
1932-10-01
DOI
10.5594/J05480
ISSN
Print: 0097-5834
Link
https://doi.org/10.5594/J05480
Author(s)
A. WarmishamTaylor, Taylor & Hobson, Leicester, England.
R. F. MitchellBell & Howell Company, Chicago, Illinois.
Copyright
© 1932 Society of Motion Picture and Television Engineers, Inc.
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A. Warmisham and R. F. Mitchell; The Bell & Howell Cooke Varo Lens, Journal of the Society of Motion Picture Engineers ( Volume: 19, Issue: 4, October 1932); SMPTE, 1932. Available at https://doi.org/10.5594/J05480
Snippet:
A. Warmisham and R. F. Mitchell; The Bell & Howell Cooke Varo Lens, Journal of the Society of Motion Picture Engineers ( Volume: 19, Issue: 4, October 1932); SMPTE, 1932. Available at https://doi.org/10.5594/J05480

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Preview:
A. Warmisham and R. F. Mitchell; The Bell & Howell Cooke Varo Lens, Journal of the Society of Motion Picture Engineers ( Volume: 19, Issue: 4, October 1932); SMPTE, 1932. Available at https://doi.org/10.5594/J05480
Snippet:
<span class="citation">A. Warmisham and R. F. Mitchell; <cite>The Bell &amp; Howell Cooke Varo Lens</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 19, Issue: 4, October 1932); SMPTE, 1932. Available at <a href="https://doi.org/10.5594/J05480" target="_blank" rel="noopener">https://doi.org/10.5594/J05480</a></span>

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Preview:
A. Warmisham and R. F. Mitchell; The Bell & Howell Cooke Varo Lens, Journal of the Society of Motion Picture Engineers ( Volume: 19, Issue: 4, October 1932); SMPTE, 1932
doi: 10.5594/J05480
url: https://doi.org/10.5594/J05480
Snippet:
<li>
A. Warmisham and R. F. Mitchell; <cite id="bib-10-5594-j05480">The Bell &amp; Howell Cooke Varo Lens</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 19, Issue: 4, October 1932); SMPTE, 1932
<span class="doi">10.5594/J05480</span>
</li>

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