A great lens for the price
Crutchfield Customer Review (What's this?)
The lens works great with my 5dMK3. Huge but not too heavy. Images seem just a bit flat, but easily fixed in post. I do find some chromatic problems, but those too are easily fixed in post. This lens finds the light for you. Even with a filter I was able to shoot deep into a dark shed and get a well exposed shot at 100 ISO. Very sharp at all stops.
Pros: Cheap when compared to Canon "L" lens. Auto focus is fast. Shoots in super low light!
Cons: Some Chromatic issues