Skips, thanks for the compliments :-) Yes, the Zuiko 180/2.8 do have quite
heavy CA, but it only happen on high contrast area (bright spots). It take
excellent portraits, has good color and high resolution but may not as crisp
as the Tamr*n and Nik*n mentioned. It has all the characters I needed and I
can tolerate its CA. If I ever need a clean high resolution shoot (e.g. for
landscape) I will stop it down to F8 or 11. At below link you can see my
test on its CA, at F11 the CA was reduced to a very acceptable level.
http://www.accura.com.hk/OM/180TEST.htm
C.H.Ling
> -----Original Message-----
>
> I had a 180/2.8 for many years that I shot basketball and
> portraits with. It's a great lens, but all the images have CA
> issues, especially in the corners. Ask C.H. Ling, he uses it
> quite a bit, and it takes great images, especially in his hands.
> But I belive that I remember him also remarking that the photos
> are soft in the corners with color fringing.
>
> This is the result of Olympus not using the expensive ED glass
> for these lenses. Nikon recognized the shortfall and offered
> both ED and non-ED versions of it's vaunted 180/2.8. The ED
> images have a significant more crispness to them, IME.
>
> The Tamron 180/2.5, with it's ED glass, is similar. However,
> I've heard of at least three instances where the focusing has
> gone off on those lenses from different sources, which may be an
> aberration.
>
> -----------------------------------------------------------------
> Please reply to [skipwilliams at pobox.com]
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