Hi, I just received my Tokina 12-24 f4 lens, and I am showing a couple of test pictures. These are with my Nikon D100. I have not noticed any significant CA or distortion. There has not been enough time to do any more testing, but so far I am really pleased. I did notice that it is important to make sure that the lens hood is properly seated. My first pictures showed some vignetting because I did not have the lens hood properly installed. The first picture shows my trailer in Cape May NJ, and the second shows an area behind my trailer.