Canon POWERSHOT G9 User Manual page 123

Advanced Shooting Functions
1121
Changing the AF Frame Size ([AiAF] or [FlexiZone]
Selected)
You can change the size of the AF frame to match the size of the
subject. When the subject you are aiming at is small, or when you
want to focus on a particular area of the subject, you can restrict the
area that is focused on by making the AF frame smaller.
Press the [] button,
Press the O button,
Examples:When [AiAF]is
DISPLAY
Each time you press the DISPLAY selected
Normal
button, the AF frame settings will
switch between normal and small.
When the camera has difficulty
focusing on the subject when you
press the shutter button halfway,
the AF frame will display in orange
(when AF frame is set to small).
Pressing the [] button completes Small
the setting.
When you set the AF frame to small
in AiAF mode, the LCD monitor
display will appear as shown right.
I_] he AF frame size is set to normal when the digital zoom,
digital tele-converter or manual focus is used.