Canon PowerShot G9 - Manual (Page 152)

Advanced Shooting Functions 150
See Functions Available in Each Shooting Mode (p. 270).
The flash output can be controlled in three steps, starting from FULL,
when shooting. When an externally mounted flash is attached, its flash
output can be controlled (From 1/1 (full power) to 1/64* in 1/3 steps). In
and shooting modes, please set [Flash Mode] to [Manual]
(p. 148).
* Speedlite 580EX II: 1/128
Setting the Flash Output
Shooting Mode
1
Set the flash output.
1. Press the button.
2. Use the or button to select
and use the or button to
change the flash output.
3. Press the button.
• You can change the settings holding the button down for
more than one second. You can also set in [Flash Control]
[Flash Output] in the menu (p. 48).
Be sure the external flash is turned on before making settings
for the flash.