D850 and Sigma lenses autofocus stopped working

Started Sep 15, 2017 | Questions thread
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ainos Forum Member • Posts: 80
D850 and Sigma lenses autofocus stopped working

Just got my D850 yesterday and I have tried it out with my various lenses.

First of all, the camera is AWESOME!!!!

But a problem all of a sudden occurred: I was shooting with my Sigma 50mm f1.4 ART and it was beautiful.

I switched to the 35 mm f1.4 ART and all of a sudden it won't autofocus. I switched back to the 50 and now it won't autofocus!!

What is going on?

I cleaned the little connectors.

Nikon lenses and an old Tamron works fine. The Sigma won't autofocus, they focus manually.

Is it a firmware thing?

Please, I'd like to know because it is freaking me out a little.

 ainos's gear list:ainos's gear list
Nikon Df Nikon D850 Nikon AF-S Nikkor 16-35mm F4G ED VR Nikon AF-S Nikkor 70-200mm f/2.8G ED VR II Nikon AF Nikkor 28mm f/2.8D +9 more
Nikon D850
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