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  1. lillian

    HELP! My Sigma 24-70mm 2.8 lens' AF motor doesn't seem to work

    I have a Nikon D3200 and bought a Sigma 24-70mm f/2.8 EX DG Macro Nikon Fit Lens. The manual focus seems to work fine, but Autofocus doesn't work at all--there's no sound of the motor even trying to work; it's like the button isn't sending the right signal to tell AF to work. I don't have a...
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