Society of Motion Picture Engineers : incorporation and by-laws (1916)

Page scan 000131 from Society of Motion Picture Engineers : incorporation and by-laws

Record Details:

Title:
Society of Motion Picture Engineers : incorporation and by-laws
Date:
1916
Publisher:
Washington D.C. : Society of Motion Picture Engineers
Volume:
Society of Motion Picture Engineers : incorporation and by-laws (1916)
Leaf #:
000131
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:
September 12, 2024
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An elementary investigation will show that in the case of the Petzval type of projection objective generally in use, a considerable amount of the light proceeding from the margins of the machine aperture {or film picture) is intercepted within the mounting or tube of the objective, and can not therefore reach the projection screen. By the use, however, of the types of objectives recommended in this paper, a considerable amount of light which fails to reach the projection screen, due to the vignetting action of the customary objective, may be fully availed of, because anastigmatic objectives, such as those used in photography, are characterized by a much shorter distance between their front and rear components than is the case with the Petzval objective. In virtue of this fact, a modern form of objective of compact construction can transmit as much light as a larger aperture objective of the same focal length but with greater separation between the components, and when we consider that the visible effects of aberration increase with increase in the relative aperture, it is clear that improvement in motion picture screen delineations must be reached through the compact and efficiently corrected modern anastigmat objectives of similar type to those recommended. My thanks are due to Dr. Hermann Kellner for having kindly gone over this paper prior to its presentation before the Society, and also for some demonstrations relating to the subject made at the Bausch & Lomb Optical Works. 17