Canon EOS 5D Mark II Instruction Manual - Page 76
About Predictive AF, AI Focus AF for Automatic Switching of AF Mode
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f Selecting the AF ModeN * About Predictive AF If the subject approaches or retreats from the camera at a constant rate, the camera tracks the subject and predicts the focusing distance immediately before the picture is taken. This is for obtaining correct focus at the moment of exposure. When the AF point selection is automatic, first the center AF point will focus the subject. Within the spot metering circle, there are six invisible Assist AF points ( in diagram) that function in the AI SERVO AF mode. So even if the subject moves slightly away from the center AF point, the camera can still continue focusing. If the subject moves completely away from the center AF point during focusing, the adjacent AF point will continue focusing the subject as long as it covers the subject. With a manually selected AF point, the selected AF point will focus track the subject. 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 OneShot 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. The focus confirmation light in the viewfinder will not light. 76