Samsung EV-NX300MBSTUS - Manual (Page 152)

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Camera settings menu >
User settings
Grid Line
Select a guide to help you compose a scene.
(Off*, 3 X 3, 2 X 2, Cross, Diagonal)
AF Lamp
When shooting in dark places, turn the AF lamp on in order to have a
better auto focus. The Auto Focus functions more accurately in dark places
when the AF lamp is on.