Canon eos rebel t1i - Manual (Page 111)

111
The AF modes available are [Live mode], [u Live mode] (face
detection, p.112), and [Quick mode] (p.116).
If you want to achieve precise focusing, set the lens focus mode switch
to <MF>, magnify the image, and focus manually (p.118).
Select the AF mode.
Under [6 Live View function
settings], select [AF mode].
While the Live View image is
displayed, you can press <0> to
select the AF mode on the Quick
Control screen.
The image sensor is used to focus. Although AF is possible with the
Live View image displayed, the AF operation will take longer than
with the Quick mode. Also, achieving focus may be more difficult than
with the Quick mode.
1
Display the Live View image.
Press the button.
X The Live View image will appear on
the LCD monitor.
X The AF point < > will appear.
2
Move the AF point.
You can press the key to move
the AF point to where you want to
focus (it cannot go to the edges of the
picture).
To return the AF point to the center,
press the button.
Using AF to FocusN
Selecting the AF Mode
Live Mode: d
AF point