Answering Paul's question in today's digest, the 180/2.8 does indeed have
some chromatic aberration. This is not a repairable malfunction -- it's a
matter of design. The 180/2.8 is comparable to other top-brand lenses from
the era before ED glass; fast telephotos always have some residual chromatic
aberration.
I always use a 1B filter (strong skylight filter) with my 180/2.8; it cuts
down the blue fringing appreciably.
But you may prefer to get an ED glass lens of more modern design. I don't
know exactly what's available; I think Sigma may make something suitable.
Nikon does, but you have to have a Nikon camera body... I have not tested
the 180/2.8 against any other maker's lens. I've done some beautiful
astrophotography with mine.
Michael A. Covington / AI Center / The University of Georgia
http://www.ai.uga.edu/~mc http://www.mindspring.com/~covington <><
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