Samsung NX1000 User Manual page 71

In the manual focus (MF) mode, you have to rotate the focus ring on
the lens to focus manua!Iy. When you set the MF Assist function, you
can achieve a clearer focus. This function is only available on a lens that
supports manual focus.
* Default
The focus area is magnified by 8 times when you rotate the
focus ring.
* Default
Off Do not use the MF Assist function.
The focus area is magnified by 5 times when you rotate the
focus ring.
Enlarge x5*
Enlarge x8
FA
(Focus aid
bar)
The focus aid bar rises as the focus improves when you
rotate the focus ring.