Dave, I have CFn IV-1 set to 3 and CFn IV-2 set to 1. I nearly always use the camera in full manual mode, so I don't use auto exposure. I just press the * button to focus (and the lens needs to be in AF for that to operate). The lens will stay in the current position until * is pressed again. When the lens has the focus ring taped in position, I set the camera to MF and don't press *. I just like to keep things simple.