Sony DSC-HX80 How To Use Manual page 72

3. Press the shutter button fully down to shoot the image.
Note
[Center Lock-on AF] may not function very well in the following situations:
The subject is moving too quickly.
The subject is too small, or too large.
The contrast between the subject and the background is poor.
It is dark.
The ambient light changes.
Lock-on AF does not work in the following situations:
In [iSweep Panorama] mode
When [Scene Selection] is set to [Hand-held Twilight] or [Anti Motion Blur]
When using the digital zoom
The camera may not be able to resume tracking for a while after it loses the track of the
subject.
[55] How to Use
Focus-lock
Shoots images with the focus locked on the desired subject in auto focus mode.
1. Place the subject within the AF area and press the shutter button halfway down.
The focus is locked.
2. Keep pressing the shutter button halfway down, and place the subject back in the
original position to re-compose the shot.
3. Press the shutter button down fully to take the picture.
Using shooting functions Adjusting the focus