: I saw this caution first posted on Photo.net by Konrad Beck. I'm not
: aware of a primary source reference for it myself. Unless there is a
: physical limitation to the 180mm f/2.8 MC Zuiko which isn't on the
: >200,000 180mm f/2.8 Zuiko, then I have my doubts about a limitation.
: Too bad I don't know which combo I lens tested.
Below is some correspondence I had last year with Neil Graham Watson; he
mailed me had evidence that indeed only the 180/2.8 with higher numbers than
200.000 are consider to be matched by Olympus (i.e. have no negative effect
on image quality). To bad I never received the scan of the Japanese
datasheet that mentions it as a fact.
They must have redesigned the 180/2.8 after the 180/2 was designed. The
scanned data sheet (0584) of the 1.4xA in the eSIF doesn't mention either of
the 180mm lenses. At least this is evidence that the original 180/2.8 was
not compatible at least not for Olympus' quality standards. The 1085 Lens
Handbook (containing the 180/2) doesn't mention the 180/2.8 either as being
compatible.
Maybe there's a list member with a later 1.4 xA data sheet in English that
mentions both 180mm lenses? If so, I would like a scan. And a data sheet of
the later 180mm lens (if it exists) would als be nice; maybe the lens
cross-section diagram reveals some differences.
hnz
My 0187 OM System brochure does not mention the 180/2.8 as one of the
lenses suitable for use with the 1.4xA. However, in the 1984 OMS
Sytem Lens Handbook under the Specificaations section it says, "In
combination with the Teleconverter 1.4X-A, you can use it as a 250mm
F4 lens." In addition the cutaway drawing of the lens construction
shows the back element to be well recessed.
--
Winsor Crosby
Long Beach, California
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