Doug Weasner Offline Upload & Sell: Off
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On my D90, my Sigma 70-200 HSM II AF's ok, but IQ is mush at f2.8. f4 is great to excellent. Haven't gotten around to sending it to Sigma.
Test the lens live view focused at f2.8, f4, and f5.6. If it looks ok at f4, but doesn't at f2.8, a trip to Sigma for optical adjustment is in order. If it looks ok at f2.8, then tweak AF to the best of your ability after study of the manual and info on the 'Net. If it still doesn't get it done, you can try the AF adjustment on your D700 and/or sending the lens (possibly with the body) to Sigma for calibration.
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