Samsung NX1000 User Manual page 68

The AF area function changes the positions of the focus area.
Generally, cameras focus on the nearest subject. When there are a lot
of subjects, however, unwanted subjects can be in focus, in order to
prevent unwanted subjects from being in focus, change the focus area
so that a desired subject is in focus. You can get a clearer and sharper
photo by selecting an appropriate focus area.
You can set the focus on an area you want. Apply an oubof-focus e_ect
to make the subject more distinguishable.
The focus on the photo below was repositioned and @sized so that it
fits the subiect% face.