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 #:
00076
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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THE NATURE OF LIGHT are dotted. The points b and c are interchangeable; an object placed at either is sharp at the other. Rule for Conjugate Foci. Now for every position of the object there is a certain position of the camera, and these two distances, the distance of the object from the lens and of the lens from the plate, are called conjugate foci. ft ^^^.P'o^'i^m^^^t^im^m^mtm^ Fig. 24. Conjugate foci. A very simple mathematical rule connects the distance from lens to object (D) the distance from lens to plate (d) and the enlargement or reduction of the object (i.e., the number of times a given line in the object is larger or smaller in the image). Note the word Hne, because some prefer to calculate reduction Fig. J 5. Determination of Conjugate foci. and enlargement on the basis of area, which introduces diflferent conditions. Let F be the focal length of the lens and r the ratios of enlargement or reduction. Then the distance d is equal to F plus F divided by r. Expressed more shortly : 61