Samsung EV-NX20ZZBSBUS - Manual (Page 90)

Shooting Functions
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Shooting Functions Shooting Functions
When you cannot achieve an appropriate exposure because of a strong
color contrast or you want to capture a photo on which the subject is
out of the auto focus area, lock the focus or exposure and then capture
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 [
a].
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, exposure
lock, or both of them. A function executed by half-pressing [Shutter] varies
according to the function assigned to [
a]. (p. 129)
Exposure/Focus lock