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 #:
000213
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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196 LOYD A. JONES AND OTTO SANDVIK [J. S. M. P. K. power for Reprotone B is slightly lower than motion picture positive. For values of contrast greater than 1 to 3.2, however, the resolving power of Reprotone B is markedly greater than that of motion picture positive. The effective contrast in sound recording is a function of the modulation of exposure and the amount of scattered light present due to lens aberrations, lens flare, dirty lens surfaces, etc. It is difficult to determine the mean effective contrast existing under practical ONE: POSITIVE: S.B. B>OR*X PEVELOPER. 60 <bO 40 TIME. OF DEVELOPMENT IN MINUTES 4 8 IZ. Ifc FIG. 9. Resolving power-time of development curves for motion picture positive for an image density of 0.30, developed in metol hydroquinone borax. sound recording conditions. It seems almost certain, however, that with a high quality optical system in perfect adjustment the mean effective contrast should be well above the 3.2 ratio and under such conditions Reprotone B should be somewhat superior to motion picture positive from the standpoint of resolving power. We have seen above (Fig. 6) that the sensitometric characteristic curve of the experimental, high contrast emulsion is quite different from that of the motion picture positive. Likewise, the resolving