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 #:
000419
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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416 AYLING The projected spot size can also be calculated by the product of the magnification formula for each lens.1 ! ^ (6) A M2Mi S = projected spot diameter A = aperture diameter. Substituting (2) and (3) we arrive at A i * m = A h <F=W "TROUPER" AND TELEVISION The more recent type of television camera tubes are the image orthicon2 RCA-5769 and RCA-5655. They are recommended for outdoor pickup use, but are also suitable for studio use, where the illumination is greater than about 50 foot-candles. The spectral response of these tubes has a high blue, good green, useful red, and practically no infrared sensitivity. Absence of infrared response permits portrayal of colors in more nearly their true gradation. The "Trouper," with extremely high intensities and a color temperature in the blue region, is well suited as a light source for television pickup. In most studios it can be located 30 to 35 feet from the televised object, resulting in intensities up to about 2000 foot-candles, and an over-all illumination of 6000 lumens. The "Trouper" is practically noiseless in operation, and under actual test operations, it has been found that no noise interference is picked up by the microphone. REFERENCES (1) J. Valasek, "Elements of Optics," McGraw-Hill Book Company, New York, New York, p. 67. (2) RCA Tube Handbook News, "Image Orthicon Type 5769," Commercial Engineering, RCA, Harrison, New Jersey, issue 49B.