600mm f/4 FL autofocus stopped working

Started 3 months ago | Discussions thread
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MBolte New Member • Posts: 10
600mm f/4 FL autofocus stopped working

I have the latest 600mm f/4. Have used it lots with a D850 and Z7.

I put it on my new Z9 with FTZ adapter with the most recent firmware upgrade this morning and the autofocus did not function.

Put it on the D850 and Z7, same problem.

I obviously checked all the usual stuff with M/A and focus recall switches and made sure the three bodies autofocused with other lenses. Wiped the contacts with a microfiber cloth (they are clean and shiny).

The lens is lightly used and 2-years old. I can feel and hear faintly the VR come on when I try to focus, but there is no indication that the focus motor is attempting to move.

I have no idea if there are electronics smarts in the lens that may have been set to a funny state by the Z9.

Does anyone have suggestions for me to try before I package this up and ship it to Nikon? Given the size/weight of this beast, that alone will be expensive.

Also, does anyone know which functions go with which contacts on the lens?

thanks ahead of time

Nikon D850 Nikon Z7 Nikon Z9
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