Canon EOS 50E - Manual (Page 37)

4. AF Modes
The camera can autofocus in one of three modes: One-Shot AF, Al Focus
AF, and Al Servo AF. Select the AF mode most suitable for the subject.
Turn the AF mode dial and set the
desired AF mode. The AF mode dial
settings are expiained below.
One-Shot AF
This mode is suited for still subjects. Since the picture cannot be taken
unless the subject is focused, this mode helps prevent out-of-focus shots.
Pressing the shutter button halfway activates the autofocus. When the
active focusing point achieves focus, it fiashes in red and the in-focus
indicator lights in the viewfinder. The exposure is also set when focus is
achieved.
It you keep pressing the shutter button halfway after focus is achieved, it will lock
the focus and the exposure setting. You can then recompose the shot without
changing the point of focus and exposure.
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lf the in-focus indicator in the viewfinder blinks, the picture cannot be taken. Either
recompose the shot or follow the countermeasures explained in “5. When
Autofocus Fails” on page 39.
Al Focus AF
In this mode, One-Shot AF ls_LtieJlprmal AF mode. However, if the
subject starts to move, the camera detects the subject’s movement and
switches to Al Servo AF automatically.
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.
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