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07-25-2019, 07:58 PM   #1
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Join Date: Mar 2008
Location: Toronto
Posts: 212
Help needed:Tokina atx pro 28-70 f2.8 stops autofocus

It was mounted on K1 today. Suddenly, it can not register AF consistently. The carema will show MF and stop autofucusing after a few rotations, although all settings on camera and the lens clutch indicated autofocusing setting. I unmounted it, played around a bit, then put back on K1. It shows AF.C but revert to MF after took a few photos with successfully autofocusing. I tested on K10 with same results.

Anyone know what's going on and what will be the fix?

07-25-2019, 08:30 PM   #2
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Join Date: May 2015
Location: Melbourne
Posts: 905
Clean the contacts on the lens and the camera, and see if that helps.
A microfibre cloth seems to work well for me.

07-26-2019, 01:25 AM   #3

Join Date: Oct 2010
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I'd clean it and just to make sure that gears are in good position, switch back to MF and turn focus, then back to AF and again.

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