Canon EOS 50E - Manual (Page 38)

Al Servo AF
This mode is suited for subjects which move sporadically. While the
shutter button is pressed halfway, the camera continues to focus the
subject. With predictive AF, * an approaching or retreating subject can be
focused. The exposure is set immediately before the picture is taken.
* Predictive AF
If the subject approaches or retreats from the camera at a constant
speed, the camera focuses the subject continuously and predicts the
position of the subject for the moment of exposure to obtain accurate
focusing.
III. AF Modes and Metering Modes
Focusing Point Operation in Al Servo AF Mode
Ai Servo AF
Automatic
Seiection
■ The center focusing point focuses the subject first.
• if the subject then moves to another focusing point, focusing continues
with predictive AF
□
Eye-Controiied
Selection
• Eye-Controiled Servo AF takes effect. By foiiowing the moving
subject with your eye, focusing continues with predictive AF See
page 48.
Manual
Selection
• Predictive AF continues with only the selected focusing point.
When the focusing point selection is automatic and the center focusing
point first focuses the subject, the camera switches to Al Servo AF if the
subject moves to another focusing point in the viewfinder during
autofocusing.
0
» In this AF mode, the in-focus indicator does not iight and the beeper does not
sound even when focus is achieved.
• A blinking in-focus indicator in the viewfinder indicates that focus has not been
achieved.
• In this AF mode, the focus cannot be iocked.
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