Collins Concise English Dictionary © HarperCollins Publishers::
ISO rating n
  1. a classification of film speed in which a doubling of the ISO number represents a doubling in sensitivity; for example, ISO 400 film requires half the exposure of ISO 200 under the same conditions. The system uses identical numbers to the obsolete ASA rating
Etymology: 20th Century: from ISO
'ISO rating' also found in these entries (note: many are not synonyms or translations):
ASA/BS - DIN - film speed - speed

Forum discussions with the word(s) "ISO rating" in the title:


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