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 #:
000441
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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74 LESTER March still photographer's flashlamp. We found that the standard General Electric focal-plane flashlamp 31 has a light output lasting nearly 70 milliseconds, with a nearly level plateau of almost 56 milliseconds. At camera speeds of 3000 frames per second, this is enough to expose nearly 4 feet of film. Then 17 such flashlamps, fired in succession with suitable overlap, will provide one full second of continuous light, substantially uniform in level. Fig. 1 — The author photographing a drone fly with high-speed camera and continuous flash-lighting units. (Photo by David B. Eisendrath, Jr.) A pair of continuous flash-lighting units (described elsewhere2) produce about 3,000,000 lumens for a period of one second. This is several times the brilliance of normal July sunlight. When the built-in tinier on the camera is set to start the flashing after 35 to 40 feet of film have run through, the lamps in both'units will continue flashing to expose the remaining 60 or 65 feet of the film as it attains the speed of 3000 frames per second. As for exposure level, two units, each 24 inches from the subject, cover an area more than 2 feet square, with sufficient light to expose fast black-and-white film at //ll to //16, with the camera at peak speed of 3000 frames per second. Color film can be exposed quite adequately under the same conditions at //2.7 to//4.5. The heat output