I have that adapter and i have never put my camera in autofocus mode…..what they mean by that is snap the focus ring away from you so it doesnt have the hard stop in both directions….in other words, if you can spin the rind around an till infinity, you’ll be able to adjust the focus to get it just right.
I’m sorry for not having all the technical terms down, but if you have the camera you should understand what i’m saying.
good luck
-brian