Canon IXUS 115 HS - Manual (Page 54)

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You can shoot with the flash turned off.
Press the r button.
Choose !.
 Press the qr buttons to choose !, then
press the m button.
 Once set, ! will appear on the screen.
 To turn the flash back on, follow the steps
above to choose
.
Turning the Flash Off
What if a flashing appears?
When you press the shutter button halfway in low light conditions where camera
shake is likely, a flashing
will appear on the screen. Attach the camera to a
tripod to prevent it from moving.