Canon EOS Rebel XTI - Manual (Page 56)

56
You can change the AF mode to suit different subjects such as group
photos, animals, and sports.
1
Press the <ZAF> button.
X [AF mode] will appear.
2
Select the AF mode.
Press the <U> key to select the AF
mode.
3
Focus the subject.
Aim the AF point over the subject and
press the shutter button halfway. The
camera will then autofocus in the
selected AF mode.
Selecting the Best AF Mode
One-Shot AF
Ideal for still subjects and snapshots. When you press the shutter
button halfway, the camera will focus only once. While you hold
down the shutter button halfway, the focus will be locked. You can
then recompose the shot if desired.
AI Focus AF
This is for subjects moving unpredictably, such as animals. When
you press the shutter button halfway, the camera will focus in the
same way as One-Shot AF. Then if the subject starts to move, the
camera switches to AI Servo AF and focuses continuously.
* AI stands for Artificial Intelligence.
AI Servo AF
Geared for sports photography and other moving subjects. While
you hold down the shutter button halfway, the focus and exposure
setting will be adjusted continuously.
E : Changing the AF ModeN