Journal of the Society of Motion Picture Engineers (1930-1949)

Page scan 000480 from Journal of the Society of Motion Picture Engineers

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 #:
000480
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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TWENTY-LENS HIGH-SPEED CAMERA 477 >ject distance increases. As the object distance is increased the lount of blur decreases. It is obvious from this figure that if the tera is to record a scene with a quality superior to the resolution of ic film, the object must be at infinity. The lenses are therefore ljusted for infinity. To record an object at distances less than ifinity, it is necessary to use collimating lenses. For the pilotmodel camera, three such collimators were selected. These had focal lengths of 5l/z, 8y4, and l$l/z feet, respectively. Thus, if an object is placed at 5V2 feet from the camera with the first collimating lens, Fig. 9 — Resolution chart as recorded jDyA20-lens*camera. the object will be essentially at infinity. Fig. 8B illustrates the image blur as a function of object distance for each of the three collimating lenses. It should be noted that at the object distance corresponding to the focal length of each collimating lens the amount of blur is zero. The optical resolution of this camera is then limited not by im>roper image tracking but rather by (1) image rotation, (2) curvature field, and (3) the use of a slit instead of a circular aperture. Image rotation can be kept below the value of film resolution by a largeleter lens wheel which also reduces film-plane curvature. A rectangular or slit aperture undoubtedly reduces the resolving power