Hi Angel:
> I don´t know the groups
> of the " MC "
There is a give away marking on the "MC" marked 50mm f/1.8 which tells you
it's the 6 element in 4 groups design and grew by 1 mm in length over the
older 6 element in 5 group design. It's the 1 mm thick aluminum ring base
side to the depth of field and mount release buttons. Modern Photography (May
1983, page 94) claims the change happened in 1979. I think they were wrong.
FWIW, Olympus literature supports October, 1980 as a closer date to when it
made it to market.
Gary Reese
Las Vegas, NV
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