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[OM] 180/2.8 chromatic aberration

Subject: [OM] 180/2.8 chromatic aberration
From: "Michael A. Covington" <covington@xxxxxxxxxxxxxx>
Date: Thu, 27 Aug 1998 19:09:55 -0400
Cc: <paul.vangossum@xxxxxxxxxxx>
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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