Devon,
Much detail is in the archives about this. I have three black nose 50/1.4
lenses, each of which is in a different serial number range. IMO, the most
important break point is whether its serial number is over or under
1,000,000. Among the black noses there was a clear reformulation that can
be seen in the lens coatings. Under 1M S/N has only some of the elements
multi-coated. Over 1M S/N has all the elements multi-coated.
As to the break point at S/N 1.1M, IMO it's only the objective ring
markings that changed with Olympus dropping the "MC" mark. From a glass
examination and performance standpoint I cannot tell the difference between
one with S/N > 1M and another with S/N > 1.1M. If it weren't for the
marking and S/N differences, I wouldn't be able to distinguish between them.
There is a noticeable difference between these two and a third with S/N <
900k in the appearance of the glass, and a very minor difference in
performance. All three lenses are in similar EX++ condition with perfect
glass and aperture mechanisms. There is very minor, cosemetic paint wear
showing in a few spots on the aperture ring knurling high points. IOW,
they haven't been dropped, bashed or otherwise subjected to harsh environs
and/or high g-forces.
A few other list members may differ in opine about S/N > 1M versus S/N >
1.1M. IMHO, in practical use making large prints from extremely fine grain
films (e.g. 11x16" Ilfochromes from K-64 and RDPIII trannies) it doesn't
matter. What does matter is lens condition, and what matters even more is
how you use it.
-- John
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