Canon eos rebel T2i - Manual (Page 118)

118
Using AF to Focus
The dedicated AF sensor is used to focus in the One-Shot AF mode
(p.66), using the same AF method as with viewfinder shooting.
Although you can focus the target area quickly, the Live View image
will be interrupted momentarily during the AF operation.
1
Display the Live View image.
Press the button.
X The Live View image will appear on
the LCD monitor.
The small boxes on the screen are
the AF points, and the larger box is
the magnifying frame.
2
Select the AF point. N
When you press the button, the
Quick Control screen will appear.
X The settable functions will be
highlighted in blue.
Press the key to make the AF
point selectable.
Turn the <6> dial to select the AF
point.
Quick Mode: f
AF point
Magnifying frame
COP
Y