Pentax Optio A40 Operating Manual page 72

When the camera recognizes the subject's
face, a yellow focus frame appears on it.
The position and the size of the frame
change while the camera continues to
adjust the focus on the moving subject.
4
Press the shutter release button
halfway.
The focus frame on the LCD monitor will light green when the camera
is in focus.
5
Press the shutter release button fully.
The picture is taken.
• If the camera cannot recognize the subject's face in Portrait mode,
the camera focuses using the Focusing Area (Multiple).
4
• "Face Recognition AF" and "Face Recognition AE" may not work
if the subject's face is partly covered, for example, with
sunglasses, or when the subject does not face the camera.
• The AE metering mode is fixed to Multi-segment.
• When you select Auto Picture mode and the camera automatically
switches to Portrait mode, "Face Recognition AF" and "Face
Recognition AE" are activated.
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