Samsung EV-NX100ZBABUS - Manual (Page 77)

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Shooting Functions
When you cannot achieve an appropriate exposure because of a strong
color contrast or you want to take a photo on which the subject is out of
the auto focus area, lock the focus or exposure and then take a photo.
To lock the exposure or focus, adjust the photo’s composition on which
you want to focus or calculate the exposure, and then press [
E].
Exposure/Focus Lock
After locking the exposure or focus, aim the lens where you desire, and
press [Shutter].
You can change the function assigned to the button to focus lock, or both of
them. A function executed by half-pressing [Shutter] varies according to the
function assigned to [
E]. (p. 92)