ISO 9848:2003

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ISO 9848:2003 is a standard that specifies how to determine the ISO speed and ISO average gradient of black-and-white photographic films. It is used for microfilming source documents like books, periodicals, and business correspondence. 

ISO 9848:2003 specifies a method for determining the ISO speed and ISO average gradient of black-and-white camera negative photographic films used for first generation microfilming of source documents at exposure times typically found with tungsten sources.