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 #:
000493
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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488 FREDERICK E. BARSTOW GUIDE NUMBER November Although the energy in the infrared approaches the energy in the visible region of an electric-flash source, the lower sensitivity of infrared film makes the over-all combination of electric-flash source, filter and infrared film considerably slower than the electric-flash panchromatic film combination. However, it is as fast as, or slightly faster than, the electric-flash Kodachrome combination. These speeds can be considered in terms of the commonly used guide num Fig. 4. Electric-flash infrared photograph; note "freezing" of fan blade. bers (aperture or /-stop multiplied by distance). For example, a small electric-flash unit might have a guide number of 150 to 200 for super-speed panchromatic film, a guide number of 30 for Kodachrome, and a guide number of 30 to 50 for infrared film when a Wratten 88 A filter is used. It is understood that if a Wratten 87 filter, which cuts off at approximately 7,600 A, is used, the guide number will be reduced. It can be said in general that the infrared guide number will be at least equal to the Kodachrome guide number for a given electric-flash unit. Any subject that can be photographed in color can probably be photographed in infrared with identical equipment.