Samsung Galaxy NX500 Camera User Manual (en)

My Camera > 
Connecting the external flash
Mount the flash by sliding it into the hot-shoe.
Lock the flash into place by turning the hot-shoe fastening dial 
Lift up the flash for use.
You can capture a photo with a flash that is not fully charged, but it is 
recommended to use a fully charged flash.
The available options may differ depending on the shooting mode.
When you use Red-eye correction, there is an interval between two bursts of 
the flash. Do not move until the flash fires a second time.
SEF8A may not be compatible with other NX series cameras.
For more details about optional flashes, refer to the user manual for the flash.
Use only Samsung-approved flashes. Using incompatible flashes may damage 
your camera.