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i.s.o.

The equivalent of A.S.A. and I.E., just with another name, it is another way of saying the same thing. This is the least frequently used of the three, but is sometimes found on the light meter. Treat it just as if it was A.S.A. I.S.O. stands for International Standards Organization.

thepolliofolioglossaryofcinematographyterms