Samsung EV-NX3000BOIUS - Manual (Page 78)

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Shooting Functions >
AF area
Multi AF
The camera displays a green rectangle in places where focus is set
correctly. The photo is divided into two or more areas, and the camera
obtains focus points of each area. It is recommended for scenery photos.
When you press [Shutter] halfway, the camera displays the focus areas as
shown in the photo below.
Tracking AF
Compose your shot and press [o] to focus on the subject. Tracking AF
allows you to track and automatically focus on your subject, even when
the subject is moving or when you change the shooting composition.
White frame: Your camera is
tracking the subject.
Green frame: Your subject is
in focus when you half-press
[Shutter].
Red frame: Your camera failed to
focus.