Practical cinematography and its applications (1913)

Page scan 00071 from Practical cinematography and its applications

Record Details:

Title:
Practical cinematography and its applications
Date:
1913
Publisher:
Philadelphia, Lippincott
Volume:
Practical cinematography and its applications
Leaf #:
00071
Language:
English
Collection:
Books
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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44 PRACTICAL CINEMATOGRAPHY diameter of the aperture may be varied from approximately f to J of an inch. Now it is obvious that more light can be passed through the lens with the larger, than with the smaller, aperture. While the larger aperture would do excellently for filming a football match on a dull day in mid-winter, it would be useless for a seascape on a cloudless day in July. For the latter the smallest aperture would suffice. But the requirements between these two extremes must be met: in other words the aperture must be adapted to intermediate demands. By turning the milled ring in which the iris diaphragm is mounted the size of the aperture can be varied even to a minute degree and thus adjusted to any sort of light conditions. For the guidance of the operator the total rotary travel of the ring is graduated to six different definite points or as many different sized apertures. These are as follows :— //3'5 gives an aperture f-inch in diameter (nearly) 4 », „ i-inch 5'6 M M J-inch „ ,, 8 „ „ J-inch „ ii M i) J-inch „ „ 16 „ „ J-inch ,, Although the differences between these successive apertures are very slight, they exercise a very