Canon POWERSHOT S100 User Manual page 50

You can shoot with the flash turned off.
Press the i_ button.
D
Choose _).
Press the _ _, buttons or turn the O dial to
choose (_, then press the @ button.
If the flash is raised, it will automatically
lower.
Once set, (_ will appear on the screen.
To turn the flash back on, follow the steps
above to choose _A.
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.
You can use the digital zoom to zoom up to approximately 20x maximum, and
capture subjects that are too far away for the optical zoom to enlarge.
Move the zoom lever toward E,_-I.
Hold the lever until zooming stops.
Zooming stops at the largest possible
zoom factor without image deterioration.
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