Excerpt: I have been wanting a wide angle zoom for a couple years but have never really wanted to dump the money on a Canon L lens. I thought that this lens would be the ticket, it's not. This lens has been nothing but problems. It wont focus to infinity, the focus clutch locks up so you can't focus at all, and occasionally something inside the lens shorts out and the outside of the lens gets warm to the touch.
Pros: Nice Bokeh, Sharp Focus Sometimes, Very sharp images
Summary: I bought this specifically to do real-estate and events (I hate events so I refused to buy a 24-70). It is very sharp for those purposes and vary much rivals the nikon and canon equivalents for 1/3rd the price. Distortion is hardly a problem, which is not true for my other Nikon option. I will say it has some pretty obvious chromatic aberration but that's easily fixed on lightroom, photoshop, aperture, etc.
Summary: The item was as described and thanks to Amazon checking to make sure the lens was compatible with my camera. This made my purchase easy. It's a great wide angle lens, great for long exposures at night. The infinity setting is properly calibrated for easy use.
Summary: I bought this lens to use with my Canon 6D as a replacement of my Canon 10-22mm on a 7D. I'm pleasantly surprised at the quality and build of the lens for the price. Results are comparable to the Canon 10-22mm. Better build with good sharpness and low distortion. AF can be a little noisy but nothing to complain about. Seeing some CA but not as bad as in the Canon 10-22mm.
Excerpt: Made this purchase for landscape photography on and up coming trip. But used it at a recent air show with excellent results. Also comes in handy for shooting real estate. It is fast focusing and well built. The f4 aperture is not a problem on my Canon 5d mk3. I would recommend at least giving this lens a serious look for anyone looking for a wide angle.
Pros: Fast / accurate auto-focus, Strong Construction
Excerpt: This lens deserves 5 stars mainly because of the excellent performance for the price. I have used the Nikkor 14-24mm f/2.8 and 16-35mm f/4 on several jobs and they are great and give very sharp images with well controlled vignetting/distrotion. This Tokina 17-35 f/4 has given me beautiful images with very good contrast and color. It is slightly less sharp than those two wides mentioned above.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Strong Construction
Summary: This lens is quite compact, though not very light weight, and solidly built like all other Tokina lenses. Optically it's superb. Very sharp and high resolution across the frame wide open. Best part is the distortion: probably the lowest among all FF UWA lenses, which means you can do architecture shots without having the stupid curved lines and having to do post processing to correct it. The filter is a little huge at 82mm.