Meaning of film speed
Film speed
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Digital photography
Glossary of photography terms
Meaning and definition of film speed :
A film's sensitivity to light, rated numerically so that it can be matched to the camera's exposure controls. Film speed ratings increase as the sensitivity of the film increases. The two most commonly used scales, ASA (American Standards Association) and DIN (Deutsche Industrie Norm), are now superseded by the system known as ISO (International Standards Organization). ASA 100 (21° DIN) is expressed as ISO 100/21°or simply lSO 100.
For the term film speed may also exist other definitions and meanings, the meaning and definition indicated above are indicative not be used for medical and legal or special purposes.
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Film speed
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