In your message dated: Sun, 27 Sep 1998 03:23:44 MDT you write:
>
>Winsor writes:
>
>So if I understand you correctly, a well designed 300/f4.5 with a little
>low dispersion glass will correct for chromatic aberration as well a faster
>APO design with ultra low dispersion glass. The design of the lens, like
>other design, is using materials appropriate to the task.
>===============================
>
>Not quite what I said. at f/5.6 a 300mm lens doesn't need an apochromatic
>design. I didn't say exactly where it becomes critical, but given that
>Olympus includes some low dispersion elements in the later 300/4.5 designs
>(it wasn't in the early ones) they obviously think it needs it, so I'll
>assume it does. For sure, a 300/4 does.
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.
Cheers,
--Lee
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