Tokina AT-X 16-28 F2.8 PRO FX Lens

I am interested in any feedback on this lens UW-

I have spare coin for a lens (port choice also for the aquatica housing would be a bonus). I run a d7000nik

I am not a FE lover, I want something to take action shots of pelagic's feeding(Spanish mackerel and hammerhead sharks as a target); so it has to be fast and wide but not super wide,as i want to see some sharp detail in the shot.

Your opinions are valuable to me, please don't hesitate to suggest an alternative..........

cheers,

Damon

Never tried it on a DX but on a FF, the corners aren't the sharpest until f8+. So it may work well for DX. AF is a bit loud but works. My biggest issue was QC, since we wanted 4 lenses and none of them performed the same (different distortion and sharpness). So we sent them back.