Canon EOS 7D EOS 7D Instruction Manual - Page 86
AI Servo AF for Moving Subjects, AI Focus AF for Automatic Switching of AF Mode
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f: Selecting the AF ModeN AI Servo AF for Moving Subjects This AF mode is for moving subjects when the focusing distance keeps changing. While you hold down the shutter button halfway, the subject will be focused continuously. The exposure is set at the moment the picture is taken. In the d/s/f/a/F shooting modes, AF is also possible by pressing the button. 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. 86