Sony DSC-RX10M3 - Center Lock-On AF

images while adjusting the position of the focus range finder frame by pressing
the top/bottom/left/right side of the control wheel. When you want to change the
shooting settings using the control wheel, press the in the center of the
control wheel.
Note
When the mode dial is set to (Movie) or when shooting movies, you cannot
select [Lock-on AF] for [Focus Area].
When the mode dial is set to (Movie) and [Auto Dual Rec] is set to On, the
[Focus Area] is automatically switched to [Wide].
You can select [Lock-on AF] only when the focus mode is set to [Continuous
AF].
A dotted square may appear around the whole screen in the clear image zoom,
digital zoom, or smart zoom range in order to focus using the entire frame.
Functions assigned to the control wheel or [Custom Button 3] cannot be
executed while the focus range finder frame is being moved.
The position of the focus range finder frame cannot be changed during movie
shooting.
[68] How to Use Using shooting functions Adjusting the focus
Center Lock-on AF
When you press the center button, the camera detects the subject positioned in
the center of the screen and continues to track the subject.
1. MENU → (Camera Settings) → [Center Lock-on AF] → [On].
2. Align the target frame (A) over the subject and press in the center of the
control wheel.
Press again to stop tracking.
If the camera loses track of the subject, it can detect when the subject
reappears on the monitor and resume tracking.