>>3055632Olympus OM mount. Won't work on Nikon.
Tokina made lenses for a lot of companies, I had that lens for my FG back in my pre-/p/ days and loved it. Find a Nikon F-mount version, you won't be disappointed.
Better yet, pony up a bit for the 70-210 f4 Nikon AF or if your pockets are deep enough the 80-200 f2.8 Nikon.
Nikon AF is weird, some bodies focus some lenses and others don't. All of my AF lenses are first-gen AF and don't work on D3xxx and D5xxx. But my AF-S 18-55 DX lens works on my FX Df in 1.5x mode even though technically it shouldnt. When you slap it on a 1.5x box appears automatically in the viewfinder. It's confusing if you don't know much about them. I'll try to make it easy for you.
1st-gen AF was screw-drive and the focus ring rotated as it focused automatically. They work on some 2nd-gen AF bodies with focus motors built in like the DF, D7xxx, Dxxx and D90.
2nd-gen AF has the focus motor built into the lens and there's a few different versions of that, and none of them work on 1st gen bodies if I remember correctly.
Mid-range and pro-bodies will usually focus both, my D7000 and Df will do them both, and the Df will even natively work with pre-Ai lenses all the way back to 1959, your D750 doesn't.
