Canon 1234B002 EOS 30D 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, the camera first uses the center AF point to focus. During autofocusing, if the subject moves away from the center AF point, focus tracking continues as long as the subject is covered by another AF point. 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