A special socket on a camera that allows the attachment of an auxiliary strobe light for flash pictures. It is synchronized to the camera's shutter so the light goes off at the right time.

Method of making a flash light fire at the correct moment, exactly when the shutter is fully open. Normally a camera's flash sync. speed is quoted as the highest speed that a given camera can synchronize with a flash unit (e.g.:1/125th. sec.). (see Shutter speed)

The ability of a digital camera to add external flash.