Samsung EV-NX3000BOIUS - Manual (Page 75)

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Shooting Functions >
AF mode
Single AF
Single AF is appropriate for shooting a still subject. When you press
[Shutter] halfway, the focus fixes in the focus area. The area turns green
when the focus is achieved.
Continuous AF
While you are pressing [Shutter] halfway, the camera continues to
automatic focusing. This mode is recommended for shooting a person on a
bicycle, a running dog, or a car racing scene.