Mine is also the later APO lens. I was not aware that there was an
earlier version. Something buyers will want to watch out for I think.
Jim Couch
Gary Edwards wrote:
>I believe there were two Sigma 400/5.6 designs. I have the later, APO
>internal focusing, Zen-finish version. It is excellent, light, and sharp. As
>far as I can tell it doesn't trail my Tamron 400/4 by much and it is very much
>lighter, more compact, and cheaper. A stop slower, so harder to focus, of
>course.
>
>The older, non-APO, Sigma has a pretty bad reputation, I believe.
>
>
>
>
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