Canon PowerShot G9 - Manual (Page 150)

Advanced Shooting Functions 148
See Functions Available in Each Shooting Mode (p. 270).
* [Manual] can be selected only when an externally mounted flash has been attached.
Although the built-in flash and an externally mounted flash (Speedlite
220EX/430EX/580EX II/ST-E2 Speedlite Transmitter) will fire with
automatic flash adjustments, it is also possible to set them so that it
fires without any adjustments.
Switching between Flash Adjustment Settings
Shooting Mode
1
Display the Flash Settings
screen.
1. Hold the button down for more
than one second.
2
Make settings.
1. Use the or button to select
[Flash Mode] and use the or
button to select [Auto] or [Manual].
2. Press the button.
You can also set in [Flash Control] in the menu.
*