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When tulips go wrong II

The Sigma 30/1.4 DC HSM Art seems to cause some strange AF behavior on a number of cameras (not just Pentax). I found that switching from 11-point autoselect AF to 'spot' or center-point AF seemed to solve the problem. I usually use center-point anyhow, due to thirty years of manual focus film cameras (and another two with the K-x, which lacks visible AF points).

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Uploaded on April 18, 2014
Taken on April 17, 2014