Yes, I have successfully used my Kenko 1.4X PRO 300 Teleconverter with Sigma 150-600mm C lens on my D7200. Works well and auto-focuses fine.
Hi Mike,
I'd guess that not all of the focus spots will work. I know even at f/6.3 some of the spots don't work at f/6.3 for me.
Yes Woody is right, but I always try to use the center spots only.
did you buy again??
It will probably focus OK in good light, but might hunt in low light. Sometimes there is enough light, but if there isn't enough contrast, the camera might hunt a bit more. In these situations, I usually cheat with manual focus. We tend to forget that this powerful feature still is available to most.