Sony Cyber-shot DSC-RX100 User Manual page 80

Do not cover the eyes with bangs. Do not obscure the face by a hat, mask,
sunglasses, etc.
Try to orient the face in front of the camera and be as level as possible. Keep
the eyes narrowed.
Give a clear smile with an open mouth. The smile is easier to be detected
when the teeth are showing.
The shutter operates when the smile of any person is detected.
You can select or register a priority subject for face detection. When the selected face is registered
in the camera memory, Smile Detection is performed only for that face.
If a smile is not detected, set the smile detection sensitivity to [On: Slight Smile].
Notes
Smiles may not be detected correctly depending on the conditions.
Related Topic
Tracking focus
Face Registration
Functions not available in some REC modes
Still shooting menu items not available in some REC modes
GB 80
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