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I just got this camera recently with the lens aformentioned, however upon usage, I wasn't able to autofocus anymore. Any fix?

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  • \$\begingroup\$ Is there a AF/MF-switch? If yes, move it to the AF position. \$\endgroup\$
    – Zenit
    Commented Mar 7, 2018 at 9:12

4 Answers 4

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Likely this is because you haven't switched on "autofocus" on the lens itself, move the slide from MF to AF:

enter image description here

Move the slide from MF to AF

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This lens does not have an autofocus motor in the lens. It must use the AF motor in the camera body to drive the lens focus.

Make sure the lens’s push-pull AF switch, and the camera’s AF switch are BOTH set to AF.

enter image description here enter image description here

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Actually, I have fixed the problem, I actually pushed down the lens a bit when mounting it on the body, kind of like what I do with an aps-c Canon body and its EF lenses but that was the reason it didn't work.

However, simply inserting the lens mount on to the camera and simply rotating it without pushing the lens a bit solved the issue.

I firmly took note of this, as I was at a risk of crushing the components of the camera.

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I have the same issue with this Tokina lens. Put the lens on any Nikon D610 or D800 and it will autofocus once, and then it stops to autofocus. I don't think its a mechanical coupling issue otherwise it would not autofocus at first instance. It seems more an electroninc issue, when the camera confirmes "in focus" for the first time after mounting the lens, the screw drive motor in the camera is electronically disengaged. That is why I currently only use this lens in manual focus mode as optically this is a superb lens.

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