Question about Sigma 28-300mm f/3.5-6.3 DG Macro for Canon AF

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Auto focus not working

Hi, I have a sigma 28-300mm for canon af, manual focus at all focal lengths works fine but not auto focus. when in auto focus mode and looking through the viewfinder i hear a whirring mechanical noise like it's trying to focus but just can't. is there anything i can do? thanks

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  • Anonymous Apr 07, 2009

    I have the same problem except my camera body is a sony 700 and the focus doesn't seem to work even on the manual, however, the zoom seems to unfreeze when it's not attached to the camera body. I've tried this lense on 2 different sony's and it just started happening. Could the motor drive be burned out? Is it stuck on Lens lock?

    kp

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Your Sigma 28-300mm doesn't have a HSM-motor as far as i know. When you switch it from MF to AF, you also have to disengage the manual focusing ring by pulling it towards the camera, or pushing it away from the camera. Using the AF without unlocking the manual focusing ring may damage the AF motor. 
I hope this helps, 
/Chris

Posted on Jan 19, 2009

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