Samsung NX1 - Locking the Flash Intensity

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Shooting Functions > Flash
Locking the ash intensity
When the ash mode is set to A-TTL, the camera automatically calculates
the optimum exposure through pre-ash. If the exposure is not calculated
correctly, use the FEL function. The pre-ash res on the area that you set
and the ash intensity is locked.
To lock the ash
intensity,
Set the function of [a] to FEL ĺ focus on the exposure area
ĺ press [a].