Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000550
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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May, 1930] ILLUMINATION OF OBJECTIVES 533 there is no need to take account of corrections depending on the obliquity between the central and marginal rays. The system does not contain, aside from the objective itself, any absorbing material such as a sensitometric wedge or tablet. Monochromatic light may be used, illuminating the hole by means of filtered light, a mercury lamp, etc. Example. — Measurements were made using anti-halation orthochromatic plates, with white light from an incandescent lamp with an opal globe. In the case of a photographic objective of 150 mm. focal length, these results were obtained: Relative geometrical aperture as given by the maker //4 . 5 Relative geometrical aperture from our measurements //4 . 87 Effective intensity (equivalent relative aperture) //5 . 54