Safety Shift - Canon PowerShot SX100 IS User Manual

The maximum shutter speed with synchronized flash is 1/500
seconds. Therefore, even if an aperture value is preset, the
aperture value may automatically be reset to match the
synchronized flash speed.
Aperture Value Display
The larger the aperture value, the smaller the lens aperture.
F2.8 F3.2 F3.5 F4.0 F4.3 F4.5 F5.0 F5.6 F6.3 F7.1 F8.0

Safety Shift

With and
menu, the shutter speed or aperture value is automatically
adjusted for the correct exposure when it cannot be otherwise
obtained. Safety Shift is disabled when the flash is enabled.
modes, if [Safety Shift] is turned [On] (p. 47) in the
Shooting Using the Mode Dial
89