Canon POWERSHOT SD770IS DIGITAL ELPH User Manual page 91

89
Changing the AF Frame Size
When the [AF Frame] is set to [Center], the AF frame can be resized
to correspond to the subject. Select [Small] to constrict the focal
frame to suit a small subject or to focus on a particular area of a
subject.
_' Select [AF Frame Size].
1. Press the _ button.
2. In the [] menu, use the 4, or _1,
button to select [AF Frame Size].
2
Accept the setting.
1. Use the 4- or 4- button to select
[Normal] or [Small].
2. Press the _ button.
[_] he setting is configured to [Normal] when the digital zoom
or digital tele-converter is used.