Canon T5 사용자 설명서

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: Changing the Autofocus OperationN
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This AF operation is suited for moving subjects when the focusing 
distance keeps changing. While you hold down the shutter button 
halfway, the camera will keep focusing on the subject continuously.
 
The exposure is set at the moment the picture is taken.
 
When the AF point selection (p.95) 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.
AI Focus AF switches the AF operation from One-Shot AF to AI 
Servo AF automatically if a still subject starts moving.
 
After the subject is focused in One-Shot AF, if the subject starts 
moving, the camera will detect the movement, change the AF 
operation automatically to AI Servo AF, and keep tracking the 
moving subject.
AI Servo AF for Moving Subjects
AI Focus AF for Switching the AF Operation Automatically
 
If focus cannot be achieved, the focus confirmation light <o> in the 
viewfinder will blink. If this occurs, the picture cannot be taken even if the 
shutter button is pressed completely. Recompose the shot and try to 
focus again, or see “Subjects Difficult to Focus” (p.97).
 
If [z1: Beep] is set to [Disable], the beeper will not sound when focus 
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 up.
When focus is achieved in the AI Focus AF operation with the Servo mode 
active, the beeper will sound softly. However, the focus confirmation light 
<o> in the viewfinder will not light up. Note that focus will not be locked in 
this case.