Transactions of the Society of Motion Picture Engineers (1916)

Record Details:

Title:
Transactions of the Society of Motion Picture Engineers
Date:
1916
Publisher:
Washington D.C. : Society of Motion Picture Engineers
Volume:
Society of Motion Picture Engineers : incorporation and by-laws (1916)
Leaf #:
00073
Language:
English
Subjects:
motion pictures, Cinematography -- Periodicals
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Preceeded by an unnumbered issue published in 1916 called: Incorporation and by-laws
Date Added:
December 28, 2023
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REPORT BY THE COMMITTEE ON OPTICS TO THE SOCIETY OF MOTION PICTURE ENGINEERS 6-54 a ^Vz « 6-^ it 7 inches t-'A St n-Yz It I-Ya ft 8 inches 8-K2 inches 9 inches GliNTLKMEN : Your Committee on Optics begs to offer the following suggestions : First: That the following focal lengths may be accepted as standard : 4 inches 6 inches 4-J4 " 4-% " 5 inches 5-14 " o-y2 6 inches The small differences in magnification on the screen, caused by increasing the interval between the different focal lengths from yi" to 54 "> are to be taken up by fitting the size of the screen mat to the size of the picture. Second : That the opening in the lens support of the projection apparatus be made sufficiently large as not to diaphragm down the opening of the rear component of the projection lens. Third : That the size of the opening of the aperture plate be 0.906"x 0.68". Fourth : That the designers of motion picture theatres be enlightened on the causes of the so-called keystone eft'ect, and that a deviation of 12° of the optical axis of the projection apparatus from the normal on the screen should be fixed as the maximum permissible limit. Respectfully, Hermann Kei^lner. Chicago, July 17, 1917.