Canon POWERSHOT A3100IS User Manual page 78

_Changing the AF Frame Mode
You can change the AF (Auto Focus) frame mode to match the conditions
you want to shoot.
Choose [AF Frame].
_, Press the MENU button, choose the 0 tab,
and then choose the [AF Frame] menu item.
Press the _b' buttons to choose an option.
@ Face AiAF
Detects people's faces and sets the focus, exposure (evaluative metering
only) and white balance (AWBonly).
When the camera is pointed at subjects, a white frame appears on the
face the camera judges to be the main subject, and gray frames (max. 2)
will appear on other faces.
A frame will follow a detected face that is moving within a certain range.
When the shutter button is pressed halfway, up to 9 green frames will
appear on faces on which the camera focuses.
If a face is not detected and only gray frames trio white frame)appear.
up to 9 green frames will appear on the areas the camera focuses on
when the shutter button is pressed halfway.
Examples of faces that cannot be detected:
Subjects that are far a_ ay or extremely close.
Subjects that are dark or hght.
Faces turned to the side or al a diagonal or faces with a portion hidden.
The camera may mistakenly identify non-human subjects as a face.
If the camera cannot focus when you press the shutter button halfway,
the AF frame will not appear.
@ Center ...................
The AF frame is locked to the center. This is effective for focusing on a
specific point.