Hey! I just recently bought the Fotodiox mount adapter from Nikkor F-Mount to E- mount, so I can use my two Rokinon lenses on my a7 camera.
I have the Rokinon 16mm t2.2 full frame and Rokinon 85mm t1.5 full frame. I tried the adapter with my 16mm and it worked just fine both APS-C OFF and ON. But the 85mm doesn't work when I switch between APS-C OFF and ON and it stays in ON , so I can't use the whole full frame and it sticks with the crop APS-C. I've just tried these settings in the a7 Menu since I can't find anywhere else an option to work this out.