Kevin Q. Yang
I got this lens for a week and shot couple hundred pictures. It is true that using auto-focusing, sometimes the focus is not as precise as I do it with a maginfied live-view. Once it is focused, however, the color and bokeh is beautiful. I found that autofocusing was even harder to focus in low light condition when the subject is more than 5 feet away. I thought maybe I needed to do some micro adjustment. But it was not the case. When I first hit the auto-focus button, it focused correctly. Then if I moved the camera a little bit and hit the focus button again, the lens will not focus correctly. What I had to do was to rotate the focus ring so that the focus was totally off. then I hit the focus button again. It would be ok. But even the sharpest auto-focused image was softer than the ones I focused manually using live-view. I read the other review, sounds like I had a bad copy of this lens. Maybe the autofocus motor is not working correctly. Well, this is a very expensive lens for me. So I returned it. Maybe I will get a new one in the future.