Canon EOS 7D - Manual (Page 144)

144
Using AF to Focus
2
Focus the subject.
Press the shutter button halfway and
the camera will focus the face
covered by the <p> frame.
X When focus is achieved, the AF point will
turn green and the beeper will sound.
X If focus is not achieved, the AF point
will turn red.
If a face cannot be detected, the AF
point < > will be displayed and the
center AF point will be used for
focusing.
3
Take the picture.
Check the focus and exposure, then
press the shutter button completely to
take the picture (p.136).
If the focus is way off, face detection will not be possible. If the lens
enables manual focusing even while the lens focus switch is set to
<f>, turn the focusing ring to attain rough focus. The face will then be
detected and <p> will be displayed.
An object other than a human face might be detected as a face.
Face detection will not work if the face is very small or large in the picture,
too bright or too dark, titled horizontally or diagonally, or partially hidden.
The <p> focusing frame might cover only part of the face.
When you press < 9 > straight down, it will switch to the Live mode
(p.142). You can tilt <9> to move the AF point. If you press < 9 > straight
down again, it will switch back to u (face detection) Live mode.
Since AF is not possible with a face detected near the edge of the
picture, the <p> will be grayed out. Then if you press the shutter button
halfway, the center AF point < > will be used to focus.