Setting The Aperture Value - Canon Powershot SX120 IS User Manual

Setting the Aperture Value

You can set the aperture to a value at which you want to shoot. The camera
will set the appropriate shutter speed for the aperture value you set.
B stands for "Aperture value".
Available Aperture Values
F2.8, F3.2, F3.5, F4.0, F4.3, F4.5, F5.0, F5.6, F6.3, F7.1, F8.0
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The fastest shutter speed when using the flash is 1/500 second. As a result, the
camera will not set a shutter speed faster than 1/500 second regardless of the
the aperture value you set.
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Depending on the zoom position, some aperture values may not be available.
What if shutter speed is displayed in orange?
If the shutter speed displays in orange when the shutter button is pressed
halfway, the scene has exceeded the correct exposure limits. Adjust the aperture
value until the shutter speed displays in white. Safety shift can also be used.
Safety Shift
With M and B modes, if [Safety Shift] is set to [On] in the 4 tab, the shutter
speed or aperture value is automatically adjusted for the correct exposure when it
cannot otherwise be obtained.
Safety Shift is disabled when the flash is enabled.
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Set the mode dial to B.
Make the setting.
Turn the  dial to set the aperture value.
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Shoot.