I rented a Canon 16-35 L f/2.8 ultra-wide angle lens at the rate of $40 per day. Can some of you verify for me that this is too damn much chromatic aberration lining the side of the skyscraper for such an advanced lens? I'm thinking some prior renter of this lens was a dope and played frisbee with it or something. I have to return the thing tomorrow morning and pay up, and I'm trying to figure out if there's something to this or not. It also vignettes excessively in the upper right and left corners, even on my full frame 5D. Advice appreciated.