Canon REBEL T3I EOS 600D User Manual page 132

Changing the Autofocus Mode
u (Face detection) Live Mode: c
With the same AF method as the Live mode, human faces are detected
and focused. Have the target person face the camera.
132
Focus the subject.
3
Aim the AF point over the subject and
press the shutter button halfway.
When focus is achieved, the AF point
will turn green and the beeper will
sound.
If focus is not achieved, the AF point
will turn orange.
Take the picture.
4
Check the focus and exposure, then
press the shutter button completely to
take the picture (p.124).
Display the Live View image.
1
Press the <A> button.
The Live View image will appear on
the LCD monitor.
When a face is detected, the <p>
frame will appear over the face to be
focused.
If multiple faces are detected, <q>
will be displayed. Press the <U>
key to move the <q> frame over
the desired target face.