Samsung EV-NX200ZBABUS - Manual (Page 64)

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Shooting Functions >
AF mode
Continuous AF
While you are pressing [Shutter] halfway, the camera continues to
automatic focusing. Once the focus area is fixed on the subject,
the subject is always in focus even when moving. This mode is
recommended for shooting a person on a bicycle, a running dog, or a
car racing scene.
Manual focus
You can manually focus on a subject by rotating the focus ring on the
lens. The MF Assist function lets you easily achieve a focus. While
you are rotating the focus ring, the focus area is magnified or the
focus aid bar appears to help you achieve a clear focus. This mode is
recommended for shooting an object similar in color to the background,
a night scene, or fireworks.