Canon PowerShot G1 X User Manual page 6

Specific Shutter Speeds and Aperture Values (M Mode)
M: Manual
Calculation of standard exposure is based on the specified metering method
(p. 94).
You can customize camera operation so that turning the 0 dial changes shutter
speed and turning the _ dial changes the aperture value (p. 129).
the Flash
Output
Choose from the three flash levels in _Vl mode.
Enter M mode.
Set the mode dial to M.
Configure the setting.
Raise the flash, press the I_ button and
immediately turn the _ dial to choose the
flash output level, then press the @ button.
Once the setting is complete, [] is displayed.
by accessing MENU (p. 41) and choosing [Flash Output] in [Flash Control[ on
the 0 tab.
You can set the flash level in TV or AM mode by accessing MENU (p. 41),
choosing [Flash Control] on the 0 tab, and then setting [Flash Mode] to
[Manual[.
You can also access the [Built-in Flash Settings[ MENU screen as follows
(except when an external flash (sold separately) is attached to the camera).
Press and hold the _, button for at least one second.
When the flash is up, press the _ button and immediately press the MENU
button.
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