Sony NW-A306 Walkman A Series High-Resolution Digital Audio Player (Black) - Manual (Page 162)

Note
If you tap a position or drag the focus area to a position that exceeds the setting range, the focus area is set to the
top/bottom/left/right edge of the setting range.
This function is not available in the following circumstances.
When the [Auto Focus] switch is turned off in the camera control panel
When the [Touch Focus] switch is turned off in the camera control panel
When the focus area frame is displayed in gray or is not displayed at all
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