APEX stands for Additive System of Photographic Exposure, which was proposed in the 1960 ASA standard for monochrome film speed, ASA PH2.5-1960, as a means of simplifying exposure computation. == Exposure equation == Until the late 1960s, cameras did not have built-in exposure meters, and many photographers did not have external exposure meters.
APEX stands for Additive System of Photographic Exposure, which was proposed in the 1960 ASA standard for monochrome film speed, ASA PH2.5-1960, as a means of simplifying exposure computation. == Exposure equation == Until the late 1960s, cameras did not have built-in exposure meters, and many photographers did not have external exposure meters.
Source: Wikipedia "APEX system" · CC BY-SA 4.0
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