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 #:
000574
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
Something wrong or inaccurate about this page? Let us Know!

Thanks for helping us continually improve the quality of the Lantern search engine for all of our users! We have millions of scanned pages, so user reports are incredibly helpful for us to identify places where we can improve and update the metadata.

Please describe the issue below, and click "Submit" to send your comments to our team! If you'd prefer, you can also send us an email to mhdl@commarts.wisc.edu with your comments.




We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.

Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.

1949 CATHODE-RAY OSCILLOGRAPHY 571 there is a loss in recording speed because of the fact that the effective aperture of the lens used is halved from its value at infinity. That is, if an //I lens is used to photograph a pattern with a 1 : 1 reduction ratio, the effective aperture of the lens will be only//2. Where high speed is important, it is generally preferable to reduce the image size in order to gain an increased density advantage. Fig. 22 is a graph showing just how this advantage varies with the reduction ratio. As a practical matter, a reduction ratio of approximately 5 : 1 has been chosen so that 35-mm film can be used in cameras having relatively Fig. 24 — 35-mm cathode-ray oscillograph continuousmotion camera. inexpensive lenses. This consideration also governs the camera, type, and size used. Where it is desired to use a wide variety of films for different conditions, the most indicated camera will be one which can use 35-mm film. Most 35-mm films have a resolution more than adequate to portray everything the cathode-ray tube is capable of resolving. There is another consideration wtych dictates the use of a 35-mm film size. If one attempts to obtain 1:1 pictures, it is found that in order to cover the 4X5 film adequately, for example, it is necessary to use a lens of about 6inch focal length. In order to obtain focus, it is therefore necessary for the image to be approximately two focal lengths from the lens,