Summary: When zoomed out to 17mm, the rear element of this lens can block the return path of your camera's mirror! I did this a couple times on my D750 before I realized what was happening. What I observed was that aft er taking a shot, the mirror would get stuck in the up position. The only thing that would bring it back down is to zoom in a little bit. It doesn't seem to have damaged the mirror yet, but I'm sure not going to keep trying.
Monumental design failure, or did I get a dud lens?
Rolf H Gibbs, Amazon
8 September 2014
Summary: On my Nikon D600, when I open the lens up to it's widest (17mm), the inner lens actually touches the camera mirror and stops it from closing again after taking the shot. If I want to see through the viewfinder again (for example to take another picture!), I have to twist the zoom to a less wide setting to release the mirror. This is an inexcusable design failure for a camera built for Nikon mount. Has anyone else encountered this problem?
Excerpt: I was a fan of Tokina 11-16DX lens and had it in my bag for years. So I did not hesitate to buy this one after FX upgrade. I was pleased with build and image quality for all 35 days I used it. Only to find it broken last Friday. Aperture lever no longer controls aperture and there is a rattling sound when I shake it. I am stunned. Adorama obviously refers me to Tokina. Now my investment is tied for unforseable future.
Pros: Image quality, Profile In Lightroom4, Strong Construction
Summary: I can't believe that a lens can be this horrifically soft. I used to rock the Tokina 11-16 EF-S on my Canon 7D and it was pretty good. Not the sharpest, but definitely passable for the price and ultra wide angle with minimal distortion. When I bought my 5D mark iii, I sold the Tokina 11-16 and bought this 17-35 to replace it (since the 5D is full format and not compatible with EF-S lenses).