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In the ISO linear scale, which corresponds to the older '''[[W:American Standards Association|ASA]]''' scale, doubling the speed of a film (that is, halving the amount of light that is necessary to expose the film) implies doubling the numeric value that designates the film speed. In the ISO logarithmic scale, which corresponds to the older '''[[W:DIN|DIN]]''' scale, doubling the speed of a film implies adding 3° to the numeric value that designates the film speed. For example, a film rated ISO 200/24° is twice as sensitive as a film rated ISO 100/21°.

Translations:Adventist Youth Honors Answer Book/Arts and Crafts/Photography/14/en - Revision history

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