Samsung NX1000 User Manual page 66

Learn how to adjust the camera's focus according to the subjects.
You can select a focusing mode appropriate to the subject among
Single Auto Focus, Continuous Auto Focus, and Manual Focus. The AF
function is activated when you press [Shutter] halfway, in the MF mode,
you have to rotate the focus ring on the lens to focus manually.
in most cases, you can have a focus by selecting Single AF. Fast
moving subjects or subjects of a color similar to the background
are difficult to focus. Select an appropriate focusing mode for such
instances.
If your lens has an AF/MF switch, you have to set the switch to select a
focusing mode. Set the switch to AF to select Single AF or Continuous
AR Set the switch to MF to adjust the focus manually.
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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.
When your lens has no AF/MF switch, press [AF] to select a desired AF
mode.