The later curtain design, to the best of my knowledge, is a better match to
the reflectance of the film itself. Earlier OM-2 models could get a
substantial shift in exposure if the shutter speed was low enough for the
film to alter the sensitivity "pattern". Anything under 1/125 was entirely
centerweighted, but from 1/60 and slower, the effective pattern would get
more averaged. I had an original OM-2 and it never gave me the consistency
that I enjoyed with the OM-2S.
As to the long exposure capability, I took a couple shots with the OM-2 that
were five-plus minutes, but it ate batteries for lunch when doing so.
AG
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