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DIN ISO 2240:2005
Photography - Colour reversal camera films - Determination of ISO speed (ISO 2240:2003)
This International Standard specifies the method for determining the ISO speed of colour reversal camera films producing continours-tone pictorialimages that are intended to be viewed on transparency illuminators or by projection as slides. It also applies to 8 mm and 166 motion-picture films used in non-professional applications. This International Standard is not applicable to professional motion-picture films regardless of their applications.
Deutsches Institut für Normung [din]