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 #:
000383
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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380 LA RUE October reinforced concrete building with no heavy machinery, it was found that there was sufficient vibration to reduce picture definition noticeably when using a commercial plate camera. Plate Location — It was necessary to be able to examine the image visually, and then to obtain that identical image on as many photographic plates as desired. Commercial plateholders are normally made of wood, and it is seldom that two plateholders will locate a plate in exactly the same position. Even the same plateholder cannot be relied upon for consistency of location. As a result, even though we intended to use standard plateholders to carry the plates, the plates had to be directly located by the camera. Fig. 1 — Camera, front view. Focusing — Another effect which is normally difficult to overcome is that the photographic focus and the visual focus of a lens are often different by as much as five or six thousandths of an inch. The reason for this difference is that the focal point of a lens varies somewhat with light wavelength. The high-resolution photographic plates used in this type of work are sensitive to wavelengths different from those of the eye, making the position of best focus for the plate different than is indicated when focusing visually. This focus shift of a lens can be closely measured, and can thus be compensated for by first focusing visually and then accurately moving the plate or lens through the known distance required to bring it into photographic focus. To be