The lens markings, X.Zuiko, where X=A,B,C,D,E,F,G,..., (and say how many
elements are in the lens (A=1, B=2, C=3, etc.), are indeed all
single-coated.
However, when the prefix letter was dropped, Olympus made both multicoated
and single-coated lenses. the single-coated ones were marked "Zuiko" and
the multicoated ones marked "Zuiko MC".
Later, all Zuiko lenses were multicoated, and the MC was dropped with all
lenses marked Zuiko.
The upshot is that "X.Zuiko" lenses, for whatever letter X, are always
single-coated. "Zuiko MC" lenses are always multocoated. But a lens
marked only "Zuiko" can be either singlecoated or multicoated.
Joseph
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