One Shot AF for Still Subjects

Pressing the shutter button halfway activates the autofocus and achieves focus once. The AF point which achieves focus flashes briefly. At the same time, the focus confirmation light <o> in the viewfinder is displayed. With evaluative metering, the exposure setting (shutter speed and aperture) will be set when focus is achieved. The exposure setting and focus will be locked as long as the shutter button is pressed halfway. You can then recompose the shot while retaining the exposure setting and point of focus.

If focus cannot be achieved, the focus confirmation light <o> in the viewfinder will blink. If this occurs, a picture cannot be taken even if the shutter button is pressed completely. Recompose the picture and try to focus again. Or see "When Autofocus Fails (Manual Focusing)"

AI Servo AF for Moving Subjects

While you press the shutter button halfway, the camera focuses continuously. This AF mode is for moving subjects when the focusing distance keeps changing. With predictive AF, the camera can also focus track a subject which steadily approaches or retreats from the camera. The exposure is set at the moment the picture is taken.

In a Creative Zone mode (except A-DEP) the beeper will not sound even when focus is achieved. Also, the focus confirmation light <o> in the viewfinder will not light.

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 to 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. The focus confirmation light <o> in the viewfinder will not light.