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Old Feb 21, 2009, 4:46 PM   #1
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I checked the focus accuracy, was front focusing heavily. Did focus adjustment on K20D of -10 (max). Was pretty good but would need to go to -12 to be perfect.

Did test at 500mm, 500mm w/1.5X TC, 500mm w/1.7X TC. Both TC's auto focused with the Sigma. Used Tripod, 2 sec timer, F8(AP Priority), ISO200. Will show full frame and 100% Crop. jpegs straight out of K20D.


Test shots on regular Pentax forum.
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