On 12/15/09 4:29 PM, Carlos R wrote:
you must be sure you disengage AF by using both the camera AF/MF switch and also by pushing the focusing ring on the lens towards the camera body, as, unfortunately, these Sigma lenses can't deactivate the AF motor in the camera body only by using the lens clutch, like genuine Pentax FA* lenses do (FA* 24 mm. 2.0, FA* 300 mm. 4.5, FA* 80-200 mm. 2.8 and some others).
I'll second that. Both the Sigma EX lenses I've owned worked this way: You need to switch off AF on the camera body and pull the lens focus ring toward you. Works very well then. Not as convenient as the Pentax FA* lenses, but then again, they're about half the price of equivalent Pentax FA* glass :)
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