Stephen, I tried with my 50 1.2/7d this afternoon, but I couldn't get it to see the target---Im thinking I didn't have enough light on it---but even without that---it seemed to do a pretty good job of improving the AF. I will try in the sunlight tomorrow and give you a better review----for the moment, I'm thinking I like this software.Bob - I'd be interested to see how it works out for you.