Samsung EV-NX210ZBSBUS - Manual (Page 82)

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Shooting Functions >
Metering
Measuring the exposure value of the focus area
When this function is turned on, the camera automatically sets an
optimal exposure by calculating the brightness of the focus area.
This function is only available when you select Spot metering or
Multi metering, and Selection AF.
To set this
function, In Shooting mode, press [ m] → K →
Link AE to AF Point
→
an option.