Canon PowerShot S5 IS User Manual page 69

Aperture Setting Display
The larger the aperture value the smaller the lens opening,
allowing less light to enter the camera.
F2.7 F3.2 F3.5 F4.0 F4.5 F5.0 F5.6 F6.3 F7.1 F8.0
You can change the combinations of shutter speeds and aperture
values without altering the exposure (p. 85).
About Safety Shift/Safety FE
Safety Shift
If you set [Safety Shift] to [On] (p. 29) in the Rec. menu when the
shooting mode is
camera automatically changes the shutter speed or aperture value to
obtain the correct exposure if necessary. The safety shift function
does not work when the flash is on.
Safety FE
If you set [Safety FE] to [On] (p. 29) in the Rec. menu when shooting
with the flash in the
automatically changes the shutter speed or aperture value when the
flash fires to avoid overexposing and blowing out the highlights in the
scene.
or and press the shutter button halfway, the
, or shooting mode, the camera
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