Canon EOS Rebel SL2 Basic Instruction Manual page 128

Changing the Autofocus OperationN
One-Shot AF for Still Subjects
Suited for still subjects. When you press the shutter button
halfway, the camera will focus only once.
When focus is achieved, the AF point will turn green and the beeper
will sound.
The focus remains locked while you hold down the shutter button
halfway, allowing you to recompose the image before taking the
picture.
When the drive mode is set to <i> for continuous shooting, the
maximum continuous shooting speed is approx. 5.0 shots/sec.
For flash photography, the continuous shooting speed will become
slower (max. approx. 1.4 shots/sec.).
Servo AF for Moving Subjects
This AF operation is suited for moving subjects. While you hold
down the shutter button halfway, the camera will keep focusing on
the subject continuously.
When the drive mode is set to <i> for continuous shooting, the
maximum continuous shooting speed is approx. 3.5 shots/sec. The
pictures will be taken with priority given to subject tracking.
For flash photography, the continuous shooting speed will become
slower (max. approx. 1.4 shots/sec.).
When focus is achieved, the AF point will turn blue.
The exposure is set at the moment the picture is taken.
When [AF method] is set to [u+Tracking], focusing will be
continuous as long as the Area AF frame can track the subject.
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