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Author Message   Roberto Rossi Rating: N/A Votes: 0 Posted on Thursday, April 27, 2006 - 07:47 pm:    1/2 stop is the industry norm for most focal plane shutters. There are people who say they will adjust to 1/3 or 1/4 stop, but this is a bit pointless given the latitude of modern emulsions, tolerances in exposure meter calibration and tolerances in processing.