September 2006
Intermediate to advanced
256 pages
7h 41m
English
Content preview from The Practical Zone System, 4th Edition
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APPENDIX N ASA/ISO Numbers
Four interrelated numbering systems are commonly used to rate the speed of various films. This can be confusing if you don't understand how these numbers correlate with one another, but it's really very simple.
ASA numbers increase geometrically as the film speed increases. As the speed doubles, the ASA number also doubles. When compared to a film rated ASA 200, a film rated ASA 400 requires one-half the exposure (one f/stop less exposure) to produce a given density. Because of this logical relationship, and because ASA is still in common usage, I use ASA numbers as a reference for film speed throughout this book. ASA stands for the American Standards Association, now known as the American National Standards ...
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