Canon POWERSHOT SX150 IS User Manual page 58

You can shoot with camera sounds muted, and the flash and lamp
deactivated. Use this mode in areas where camera sounds, lights and flash
are not permitted.
.................................................................................................................................... Enter [] mode.
Set the mode dial to [].
Shoot.
The camera will select the necessary settings for the conditions in which you
wish to shoot when you choose the matching mode.
Enter SCN mode.
Set the mode dial to SCN.
Choose a Shooting mode.
After pressing the @ button, press the
Av buttons to choose _'_.
Press the 4 _' buttons or turn the _i_' !_ dial to
choose a Shooting mode, then press the
_Tc_button.
......................................... Shoot.
58