Canon EOS 5D Mark II EOS 5D Mark II Instruction Manual - Page 80

f: Selecting the AF ModeN When the AF point selection (p.81) is automatic, the camera first uses the center AF point to focus. Within the spot metering circle, there are six invisible Assist AF points („ in diagram) that function in the AI SERVO AF mode. Therefore, even if the subject moves away from the center AF point during autofocusing, focusing can still continue. Also, even if the subject moves far away from the center AF point, focus tracking continues as long as the subject is covered by another AF point. A manually-selected AF point will focus track the subject in the AI Servo AF mode. With AI Servo AF, the beeper will not sound even when focus is achieved. Also, the focus confirmation light in the viewfinder will not light. AI Focus AF for Automatic Switching of AF Mode AI Focus AF switches the AF mode from One-Shot AF to AI Servo AF automatically if the still subject starts moving. After the subject is focused in the One-Shot AF mode, if the subject starts moving, the camera will detect the movement and change the AF mode automatically to AI Servo AF. When focus is achieved in the AI Focus AF mode with the Servo mode active, the beeper will sound softly. However, the focus confirmation light in the viewfinder will not light. 80