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Message: <blockquote data-quote="Felisek" data-source="post: 484308" data-attributes="member: 23887">^ What he said. I must add that tuning the Sigma with the dock is not easy nor straightforward. In particular, you cannot put a ruler at infinity to see whether you have front or back focus. It requires a fair amount of trial and error, and every time you have to take the lens off the camera, put it into the dock and change one parameter. Needs patience.Also, I noticed that at 600 mm and the distance of 15 m, my lens was insensitive to fine tuning. Whatever the value I put through the dock, I got the same result - a slight front focus. At other distances/focal lengths I could see the effect of changing lens parameters, just not at 600 mm / 15 m.</blockquote>