A condensed course in motion picture photography ([1920])

Record Details:

Title:
A condensed course in motion picture photography
Date:
[1920]
Author:
New York Institute of Photography
Publisher:
New York, New York Inst. of Photography
Volume:
A condensed course in motion picture photography
Leaf #:
00077
Language:
English
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
14
Date Added:
July 19, 2022
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MOTION PICTURE PHOTOGRAPHY F d = F plus — . r On the other hand, D equals F plus F multiplied by r, or D = F plus F X r. An example will show how simple this rule is. Suppose one wants to reduce a picture so that a twelve-inch line becomes three inches — i. e., r = 4. If a six-inch lens is being used, d (camera extension) =6 plus 6/4 == 6 plus lyi = 73^ inches, and D = 6 plus 6x4 = 6 plus 24 = 30 inches. Bear two other things in mind which will help to use this formula: (i) Positions of image and object are reversible. If we were enlarging 3 inches to 12 with a 6-inch lens we should place the lens and negative 7^ inches apart and the paper 30 inches apart. (2) The smaller conjugate is just r times the larger, e.g., 7^ x 4 = 30. This is always the case, and is useful as a check on calculation. E2