Even as a digital camera shooter, I set the focus and put it in Manual Focus, preset the framing via FL selection, I set the exposure, and I tell them merely to press the shutter button while being sure we are NOT dead center bullseyed in the frame...exactly what I do with a film camera: prefocus, set exposure, set FL, and hand them the camera telling them to ONLY press the shutter button while being sure we are NOT dead center bullseyed in the frame