New answers tagged nikon-d5100
Try giving the focus ring a little nudge when the autofocus gets stuck. I have a Tamron 18-270 which has the same issue when zoomed at 150mm or more. It seems that due to the small change in focus required, the camera does not power the motor enough to get it moving, resulting in the noises. I don't know if you have this exact issue, it could be that the ...
If the USB cable is attached between the camera & PC, the live view LV lever doesn't engage. Ensure the cable isn't attached to your PC.
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