Canon POWERSHOT G12 User Manual page 32

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If the aperture value appears in orange when the shutter button is pressed halfway,
the scene has exceeded the correct exposure limits. Adjust the shutter speed untii
the aperture value appears in white. Safety shift can also be used (p. 106).
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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.
AV stands for "Aperture value", which refers to the size of the aperture
opening inside the lens.
Set the mode dial to AV.
Turn the _ dia! to set the aperture value.
Shoot.
Available Aperture Values
F2.8, F3.2, F3.5, F4.0, F4.5, F5.0, F5.6, F6.3, F7.1, F8.0
Depending on the zoom position, some aperture values may not be available.
If the shatter speed appears in orange when the shutter button is pressed halfway,
the scene has exceeded the correct exposure limits. Adiust the aperture value
until the shutter speed appears in white. Safety shift can also be used.
105