Lee writes:
I'd be interested to know the reference for the above claim. As stated
in the FAQ (and verified by Oly America), Olympus never redesigned a
lens to use different elements. Coatings changed, but not elements.
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Not according to Vince at Olympus USA. Call and ask him about the
history of the 300/4.5 and he'll inform you that Olympus doesn't label
their lenses as APO etc. bu they started using ED glass in that lens
at some point.
Another case is the 50/1.8 which went through several renditions of
optical formula, and the 24/2.8 which has versions with different numbers
of elements, or the 85/2 which has both 6 element and 5 element versions.
Purchase of zuiko lenses used is a veritable minefield if you care about
which version of the lens you get, as they are not marked in any way
to determine it.
j. albert
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