Film speed is the term often used to describe an emulsion's sensitivity to a given amount of light.
Sensitivity, in turn, is a product of the
amount and configuration of silver halide crystals coated on the film's
emulsion layer. This is true even for color and chromogenic
black-and-white films where the final result is devoid of silver, but
instead is composed of dye clouds. Even these two film types begin with
the exposure of light-sensitive silver,
The difference between ISO and DIN
There are two type of scales being used to denote film speed.
The two scales, ISO and DIN, are different in one respect.
Film speed is also denoted by a commonly
accepted verbal classification system:
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