Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

Record Details:

Title:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Date:
[c1916]
Publisher:
New York City, The Moving Picture World
Volume:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Leaf #:
000135
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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116 MOTION PICTURE HANDBOOK Plates 2 and 3 illustrate the relative loss through spacing of the lenses, Plate 2 shows the lenses set with their curved surfaces approximately one-sixteenth of an inch apart. Plate 3 shows the lenses spaced so that their curved surfaces are one-half inch apart. It will be observed that the loss of light is materially greater in Plate 3 than in Plate 2. It is also of interest to note the difference in the light beam itself. In Plate 2 the beam does not narrow down quite so much as it does in Plate 3, and the crossing point of the Diagram showing how the back focus and the size of the aperture of the objective lens determine the distance between condensers and anerture. 20 19 15 14 13 12 II 10 9 8 Distance between condensers and aperture when the buck focus of Plate 4, Figure 45. rays is much nearer to the lens, which means that the E. F. of the combination has been lengthened by spacing the lenses. However, due to reasons already set forth I believe it is better practice to work with a fixed E. F.y setting the condensing lenses so that their curved surfaces are not more than one-sixteenth of an inch to one-eighth of an inch apart, and make other conditions fit this one. Never have the lenses actually touching each other, since mechanical contact would serve to impart considerable heat to the front lens, which is decidedly undesirable.