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What does DIN mean?

The Deutsches Institut FÃ ¼ R Normung (abbreviated DIN) is the German national standardization body. The probably best known DIN standard is that of sensitivity of photographic material (counterpart of the American designation: ASA). This is a logarithmic unit. Each increase with 3 indicates a twice as sensitive film. Usual film sensitivities are 21 and 24 DIN.

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