I can't find a menu item for Continuous Auto Focus (on/off) on my GH1. Anyone know how to turn off this feature? With the 20mm Pancake I put the camera on AFS, and it is constantly hunting. I need to give this camera to a helper next week, and MF is not an option. I need for them to be able to focus using the shutter button as needed, which is how I run my GH2s.