NAPM IT2.51 : 0已作廢
PHOTOGRAPHY - SOURCE DOCUMENT MICROFILMS DETERMINATION OF ISO SPEED AND ISO AVERAGE GRADIENT
出版：National Association of Photographic Manufacturers, Inc.
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基本信息
標準編號： NAPM IT2.51 : 0
標準類別：Standard
出版單位：National Association of Photographic Manufacturers, Inc.
標準頁數(shù)：0
標準簡介
Determines the ISO average gradient and speed of black-and-white camera negative photographic films that are used in the first generation microfilming of source documents, that are exposed and typically found with tungsten sources.
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