DIN speed

DIN speed
System used by the German Standards Organization.
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-DIN speed - system used by the German Standards Organization.
-Diopter - unit used to express the power of a lens. It is the reciprocal of the focal length expressed in meters.

The international standard for rating film speed is the ISO scale which combines both the ASA speed and the DIN speed in the format ASA/DIN. Using ISO convention film with an ASA speed of 400 would be labeled 400/27°.

See also: Stand, Speed, DIN, Silver halide, Photographic paper