77f: Selecting the AF ModeNThis AF mode is for moving subjects when the focusing distancekeeps 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.When the AF point selection (p.78) is automatic, the camera firstuses the center AF point to focus. During autofocusing, if the subjectmoves away from the center AF point, focus tracking continues aslong as the subject is covered by another AF point.AI Focus AF switches the AF mode from One-Shot AF to AI ServoAF automatically if the still subject starts moving.After the subject is focused in the One-Shot AF mode, if the subjectstarts moving, the camera will detect the movement and change theAF mode automatically to AI Servo AF.AI Servo AF for Moving SubjectsAI Focus AF for Automatic Switching of AF ModeIf focus cannot be achieved, the focus confirmation light <o> in theviewfinder will blink. If this occurs, a picture cannot be taken even if theshutter button is pressed completely. Recompose the picture and try tofocus again. Or see “When Autofocus Fails” (p.80).If the [1 Beep] menu is set to [Disable], the beeper will not sound whenfocus is achieved.With AI Servo AF, the beeper will not sound even when focus is achieved.Also, the focus confirmation light <o> in the viewfinder will not light.When focus is achieved in the AI Focus AF mode with the Servo modeactive, the beeper will sound softly. However, the focus confirmation light<o> in the viewfinder will not light.COPY
