Canon POWERSHOT SX110 IS User Manual page 88

86
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 opening,
allowing less light to enter the camera.
F2.8 F3.2 F3.5 F4.0 F4.3 F4.5 F5.0 F5.6 F6.3 F7.1 F8.0
You can change the combinations of aperture values and
shutter speeds without altering the exposure (p. 111).
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