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I have updated my webpage (this time with test images from my modded 300D) and I am now pretty confident I have near optimal focus. Spoke to the Sigma tech at CR Kennedy and he mentioned that the DG series underwent a lot of enhancements (not just coatings) that improved lens performance when used with DSLR's. The lens was checked out as being within specification from a recent service when the previous owner complained about softness at f2.8 (incidentally he did not disclose and a few other minor issues during the purchase).
So the lesson here is get the DG designated version if possible, but if a non-DG lens is the choice then be prepared to down an extra 0.5 stop.
Terry
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