I've purchased a used Sigma 17-70mm f/2.8-4 DC OS HSM for my Nikon D3300. It appears to work fine, with one exception: the autofocus. I've checked the switch on the lens and it is set to AF. However, no autofocus seems to happen when clicking the shutter release button. The display of the DSLR shows the focus mode constantly switching between AF and MF.
I've searched for issues with this combination but I could only find a firmware issue with the D5300 and some of these Sigma lenses, and I'm not sure if that should affect my device.