All exposure systems use the ISO rating as the basis for its calculations. ISO stands for International Standards Organization. The ISO rating is used on all cameras, even though it was originally developed to be a universal guide for film speeds. A film’s ISO rating indicates its sensitivity to light, or what is generally termed the film speed. The higher the ISO rating, the more sensitive it is to light. Digital cameras follow the same rating.
Changes in ISO ratings are measured in stops in the same way as apertures and shutter speeds. For example, changing the ISO rating from ISO 100 to ISO 200 is an increase in one stop.
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