Canon PowerShot SD870 IS Digital Elph User Manual page 101

Various Shooting Methods
I
99
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.
1
Select [AF Frame Size].
1. Press the II
MENU
II
button.
2.ln the [L!J] menu, use the
+
or
.. button to select [AF Frame
Size].
2
Accept the setting.
1. Use the .. or .. button to select
[Normal] or [Small].
2. Press the II
MENU
II
button.
•
The setting is configured to [Normal] when the digital zoom
or digital tele-converter is used.