I have seen Copal 0 shutters with shutter speeds marked as B, 1, 2, 5, 10, 25, 50, 100, 250, which I assume represent 1, 1/2, 1/5, 1/10, 1/25, 1/50, 1/100 and 1/250 seconds. Why are these speeds not the normal divide the previous shutter speed by 2 kind of thing? Seems like they would be pretty off as far as being one stop from one to the next.
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