Not a super lens. Has a few quirks. Focus is iffy around the edges. Focus ring works the opposite way you'd expect. Does not communicate with the camera well, even after setting it up in the database. You see all images say F4. That is not true. F4 is the widest and it is set in the database, Just doesn't move. Can't complain for the price.
It's my second harder lens to use after the 24mm Nikon Tilt-shift.