OK, here's the deal. As the other reviewer said, the infinite focus overshoots a bit. However, with focus peaking on my Sony, this really isn't a problem. You just have to follow the focus peaking and not your instinct to "crank it up to 10" if you want to focus to infinity. I think it's very difficult to make an adapter that can agree with all infinite focus ranges of all Canon FD lenses, because I was disappointed with a Speedbooster in this regard. Some lenses just wouldn't reach infinity on that $400 piece of gear. Better to give you the option of overshooting than undershooting and never reaching infinity.However, I give it five stars because for the price, the thing is SO DARN WELL MADE. Both mounts are rock solid. It feels like a much more expensive piece of gear. And, now the real kicker...the aperture control dial is SUPER smooth. Smoother than the Speedbooster! I was considering "declicking" my FD lenses for video production, but with this I don't think it will be necessary. If you just set a minimum aperture, say f/8, you can smoothly rack the 50 1.4 between "open" and "lock" to vary the aperture from f/1.4 to f/8. It takes a bit of practice but you can do it slowly, and smoothly, enough that you don't see noticeable quantization of the camera's exposure.