Canon POWERSHOT SX150 IS User Manual page 69

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The camera will shoot, even without pressing the shutter button, when it
detects a smile.
Choose 2_.
Follow Steps 1 - 2 on p. 58 to choose 4,
then press the
DISR
button.
Press the 4 _ buttons or turn the "._i _; dial to
choose ._, then press the
DISR
button.
The camera will enter shooting stand-by,
and [Smile Detection on] will appear on the
screen.
Point the camera at a person.
Each time the camera detects a smile it will
shoot after the lamp lights.
Press the ,v button to pause smile
detection. Press the v button again to
resume smile detection.
Smiles are easier to detect if the subject faces the camera, and opens their mouth
enough to show some teeth when smiling.
After choosing ^L_ in Step 1, press the _.v buttons.
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