Summary: I purchased this as there were mostly 5 star ratings and I was looking for a UWA lens for my D700. Since I had the fantastic Tokina 11-16 (original non-motor) for my D90, I thought this lens would be an excellent buy too. I was wrong. I got a few usable pictures from it but the CA was horrible and the corners, and not extreme corners, were mushy. they were horrible at F4, and stopped down to 5.6 or F8 was an improvement but still had some "mushiness" and blur.