Sony DSC-RX100 How To Use Manual page 34

The shortest shooting distance is approximately 5 cm (0.16 ft) (W), 55 cm (1.8 ft) (T)
(from the lens).
4. Press the shutter button fully down.
Focus indicator
lights:
Image is in the focus.
flashes:
The focusing has failed.
lights:
Image is in the focus. The focused position will change to suit the motion of the subject.
lights:
The focusing is in progress.
Hint
When the product cannot focus automatically, the focus indicator flashes and the beep
does not sound. Either recompose the shot or change the focus setting. When
[Continuous AF] is set, the beep does not sound when focus is achieved.
Focusing may be difficult in the following situations:
It is dark and the subject is distant.
The contrast of the subject is poor.
The subject is seen through glass.
The subject is moving quickly.
There is reflective light or shiny surfaces.
There is a flashing light.
The subject is backlit.
The subjects in the focus area have different focal distances.
[23] How to Use Shooting Shooting still images/movies