Agfa motion picture topics (Apr 1937-June 1940)

Record Details:

Title:
Agfa motion picture topics
Date:
Apr 1937-June 1940
Publisher:
Hollywood : C. King Charney, Inc.
Volume:
Agfa motion picture topics (Apr 1937-June 1940)
Leaf #:
00098
Language:
English
Collection:
Technical Journals and Hollywood Studio System
Format:
Periodicals
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
November 02, 2023
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SUNLIGHT AND STEEL Photographed by Leon Ruder length and the f-value of the stop we want. Therefore, supposing we want to determine the diaphragm-scale position of f:8 on this same lens, we know that "f" eguals 8, and "F" equals 50. Though "D" is unknown, we know that in this case 8 equals 50 divided by "D", so "D" must also equal 50 divided by 8, which is 6.25mm. or .2462 inches. Thus we close our diaphragm down until its aperture is of that diameter — and mark that point as representing f:8. If the focal length of the lens is the unknown factor, and we know the f-value of the aperture and know or can measure its actual diameter, the same formula will give us the focal length. For if "f" equals "F" divided by "D", then "F" must equal "f" times "D". Suppose we have an f:2 lens, the maximum aperture of which measures two inches. Since "F" equals "f" times "D", the focal length of this lens must equal 2x2, which is 4 — and our lens is found to be a four-inch objective. Supplementary Lenses Another basic formula, and one which can be even more useful at times, Page Eight