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Superb optics, and I wish Sigma had put a proper focusing ring on it and made it a manual focus lens competing with the Zeiss 50s. The autofocus was a disaster where at first it would completely misfocus on closer subjects and after a "repair" and "calibration" by Sigma completely misfocus on anything past 8-10 feet.
Stupid me bought another Sigma product later (since I did like the 15-30 and 50-500 I owned), a DP2, which now has dust on the sensor (cannot be cleaned) after a month.
Never again, Sigma.
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