FujiFilm 90 - Manual (Page 45)

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( ) Night portrait (slow sync) mode
Used when taking portraits to record the background in a night scene.
Your camera will be placed in the slow shutter speed/red-eye reduction mode (The
flash fires briefly 10 times (pre-flash), then fires the 11th time for taking a picture.),
allowing you to take both the night scene and your subject clearly.
∗
This mode is automatically cancelled per shot.
As a slow shutter speed is used with the night portrait mode, ensure that a tripod is used to
prevent camera-shake. It is also important that the subject remains motionless during the expo-
sure.