Hello. I have a question about shutter speed sequence. I've noticed that most pre-war and immediate post-war shutters, and light meters, had the following speed sequence:
1/10, 1/25, 1/50, 1/100, 1/200, 1/400
Of course, the "modern" sequence is:
1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500, etc.
I've been thinking about this recently, in relation to film ISO speed. It appears to me that film speed still largely mirrors the "old" shutter speed sequence. Seems odd that Kodak, Fuji, Ilford, and others wouldn't have updated ISO, over the years, to line up with the newer shutter speeds.
I'm curious if anyone knows the history of the change in speeds and when that happened within the shutter industry. Thanks in advance.
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