Under dim lighting conditions sometimes I want to take shots without refocusing. There's an approach that has been developed to help with this and similar situations: "Back-Focus button assignment," or such. The idea is to separate the focus (and exposure settings) from the shutter button. With most default camera settings, pressing the shutter button half-way sets the focus and exposure, which is desirable most of the time. The "back-focus" allows for a separate button to auto-focus once (and exposure set) then take however many shots with the shutter button without refocusing. I've been looking through the PEN manuals. While it seems as if the AFL/AEL modes and programmable button assignments might make this possible, I sure can't figure out how to make it happen. Has anyone had success setting up a PEN camera toward this? Thanks!