Reviews and Problems with Sigma 17-70mm f2.8-4.5 DC Macro HSM
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Decentering issues in two copies, third isn't as sharp as previous
K. Yee "kenyee", Amazon
2 January 2009
Summary: Maybe I just have bad luck w/ lenses :-P The first two copies had decentering issues (left or right half of frame was fuzzy) but only at specific focal lengths and ranges...it took a few vacations and lots of shooting to see these issues.
Summary: I returned the first lens because it was back-focusing with my Pentax K100D. The second lens was ok, but strangely, softer than the first one in tests with a focusing chart (albeit no backfocusing). Both lenses appear softer than the Pentax kit 18-55mm, which is disappointing.