The above sums it up. The aperture ring is locked to f22. The lens has a knackered AFS focus motor and a repair was attempted but no spares are available. It works just fine in MF with my D850 with the aperture fully controllable from the body. Not only can I not get past the error, but there seems to be no Control Aperture with Ring option... (D850 Menu f4) In short, it won't work at all. I've got a dumb Nikon F > Z mount adapter somewhere, but thought I'd ask here before searching for it..... It seems you cannot tell the FTZ to be dumb... Am I missing something obvious...? Any ideas?