Originally Posted by
williamtheis
1/3 stop on f/stop, factors of two (1/25, 1/50, 1/100, ...) on the shutter for film, slightly better for the betterlight since scan times are 1/8 sec, 1/10, 1/15, ...
nothing approaches 1 part in 100 and it is not necessary to get the capture to this accuracy IMHO. you should do setting of final endpoints in CMYK or RGB but LAB is a little too brute force. (yes, I am VERY VERY VERY familiar with LAB having taking Dan Margulis's classes)
EVs are for 0 to about 20, each represent a doubling but spot meters conveniently read in 1/3 EV (so 2 1/3 is 1/3 stop more than 2) which matches lenses but not shutters
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