Reviews and Problems with Sigma 17-70mm f2.8-4.5 DC Macro HSM
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Cynthia Farr-weinfeld "Cynthia", Amazon
27 January 2008
Summary: I used the 17-70 for a little over a week before coming to the conclusion that mine must be defective. Where other people rave about how it focuses on a dime even in low-light levels, mine could barely be persuaded to focus on the best of days in perfect light.