Canon Powershot SD1300 IS User Manual page 79

Center
The AF frame is locked to the center. This is effective for focusing on a
specific point.
You can reduce the AF frame size
•
Press the n button, choose the 4 tab, then choose the [AF Frame Size]
menu item and [Small] option.
•
The setting is configured to [Normal] when the Digital Zoom (p. 58) or Digital
Tele-converter (p. 59) is used.
If the camera cannot focus when you press the shutter button halfway,
the AF frame will turn yellow and
Changing the AF Frame Mode
will appear.
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