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Reference.org
APEX system
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<p>APEX stands for Additive System of Photographic Exposure, which was proposed in the 1960 <a href="/facts/American_Standards_Association/p3d1TQCb">ASA</a> standard for <a href="/facts/Black_and_white/CXPjISFh">monochrome film</a> speed, ASA PH2.5-1960, as a means of simplifying <a href="/facts/Exposure_(photography)/Rzr0aGMd">exposure</a> computation. </p>