I was testing out my new Tokina 11-16mm wide angle lens at my mom's house. I think it's defective; it has a very hard time auto focusing, and when it's in Live View mode it is almost impossible to get it to focus. Hopefully I'll be able to return it. I would rather have the Canon anyway. I hate the "One-Touch Focus Clutch Mechanism". The focus ring is also how you switch from auto focus to manual focus. With HDR shots, many times I will lock focus on something, then turn the camera to the angle I want, and switch to manual focus. With this system, when you switch to manual focus, it's almost impossible not to change the focal point because you have to actually slide the focus ring backwards. If you turn the ring at all while doing so the subject is not in focus anymore. I could get around this by keeping the shutter release halfway down, then adjusting the camera angle and taking the photos, but I always use the 2 second timer or the remote to eliminate any camera shake so that won't work. The only thing I like about it is the 2.8 aperture which would come in handy in other situations. The Canon I want is 3.5-4.5... and $100 more.