I just made a switch to FF recently and I have always loved my 11-16 on my 50D.
the lens works pretty well at 16mm on FF (even wider than 11mm on crop), and i do not mind using it as a prime for landscape shots.
I'm new to ND filters and when I applied the hoya nd400 on, it creates a significant amount of vignetting. I wonder if the vignette is as strong if the nd is applied on a 17-40. any ff users have experience switching from 11-16 to 17-40? and what about the difference for corner sharpness between the 2? because f/9 is what i need to set on the tokina to have the corners look acceptable
I still use my 50D on occasion even though I'm now in love with my new toy would appreciate any comments and suggestions