Pentax Optio M50 Operating Manual page 75

• Face Recognition AF and AE may not work if the subject is
wearing sunglasses or has part of the face covered or if the
subject is not looking toward the camera.
• If the camera cannot recognize the subject's face, the camera
focuses using the Focusing Area currently selected.
• When Smile Capture is activated, the shutter will be released
automatically when the camera recognizes the subject's smile.
However, if the face detected by the camera is too small, an image
may not be captured automatically because the Smile Capture
function will not work.
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