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Wikipedia definition
1. Zone SystemThe Zone System is a photographic technique for determining optimal film exposure and development, formulated by Ansel Adams and Fred Archer. Adams described how the Zone System was developed: "I take this opportunity to restate that the Zone System is not an invention of mine; it is a codification of the principles of sensitometry, worked out by Fred Archer and myself at the Art Center School in Los Angeles, around 1939-40.
Read “Zone System” on English Wikipedia
Read “ゾーンシステム” on Japanese Wikipedia
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