Sony NW-A306 Walkman A Series High-Resolution Digital Audio Player (Black) - Manual (Page 172)

Slide the [Touch Focus] switch on the (Focus) tab in the camera control panel to the right position to turn it on, then
tap the target subject to track in any of the following states.
During manual focus or during push manual focus, and when [Shooting] > [Focus] > [Touch Function in MF] is set to
[Tracking AF] in the web menu or camera menu
During auto focus or during push auto focus (AF)
To specify by face detection frame selection
Move the face selection cursor (orange underline) to the target subject to track using the arrow buttons in the GUI control
panel, and press the [Set] button.
A: Face detection frames (gray)
B: Tracking frame
C: Face selection cursor (orange)
Note
During manual focus, tracking cannot be started by face detection frame selection.
Hint
You can also change the target to track during realtime tracking AF.
Stopping realtime tracking AF
Press the (realtime tracking AF stop) button.
Hint
Realtime tracking AF will stop in the following cases:
When the [Auto Focus] switch or AUTO/MANUAL control on the lens is switched
When the focus mode is changed
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