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 #:
000545
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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542 SHAFER November It has been found advisable to keep a smaller than 5 degrees; i.e., the / ratio of the system should be greater than //6. An //6 system of 250 centimeters focal length will result in an axial separation of tangential and sagital image of 1.73 centimeters. For an//10 system of the same focal length, the separation will be 0.625 centimeter. CONCLUSIONS The general conclusions of the preceding discussion on the effects of the aperture of the system, focal length of the optics, size of the light source, and position of the knife edge are presented in tabular form below. Fig. 16 — General types of schlieren systems using mirrors for collimator and objective, a — skewed or Z, b — Newtonian. 1. Aperture (a) A large aperture gives a high aperture-to-disturbance-size ratio with consequent high contrast and density. (b) A large aperture gives a small Airy disk which will mean a small light source to approach optimum size. This effect will be amply compensated by item (a) above. (c) A large aperture necessitates a large offset of source and knifeedge in Z-type schlieren systems giving large astigmatic distances.