Does anyone have this combo and comment on the AF speed of this lens? Would it be useable indoors/outdoors following around kids/toddlers? Please do consider 5D3's 61 point AF system before answering, I don't recompose. I also have 70-200 IS II, unfortunately ISO 6400 is as far as this camera goes for portraits in my book, which is why I need the 85L.

The AF speed is only slow on initial lock (going from infinity, for example) - once it has its focus plane - say you are using it with AI Servo - it makes the minor adjustments fast enough to keep up without any issues.


