DIN
From Nikonians Wiki
Stands for Deutsches Institut für Normung, the German Institute for Standardization. Founded in 1917, since 1975 it has been recognized by the German government as the national standards body and represents German interests at international and European standards circles. DIN is a logarithmic expression while ASA is an arithmetic one. An ISO 100 film has a DIN rating of 21; an ISO 200 film has a DIN rating of 24. The DIN number is equal to 10 times log ISO + 1 and the ISO number is equal to antilog of (DIN - 1 divided by 10), e.g. for ISO 200, log 200 equals 2.3, times 10 = 23, 23 + 1 = 24 DIN
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