Sony A6600 Focus Hunting in Beginner Forum Posted August 9 I have the NA-6400. I have not noticed AF hunting but regardless please set up the back button focus. It is a learning curve but it is also a game changer. You can prefocus on something and wait for your subject to enter the preset focus zone or focus before shooting but with BBF, when you push the shutter trigger and the camera goes click, focused or not. No wait. Set to single shot to start with and also turn off AF tracking. It seems my camera, if I keep the BBF engaged (pressed) the focus tracks, when I release the BBF it locks there until I focus yet again or the power is cycled (and possibly sleep).