Nikon SB-500 AF Speedlight - Manual (Page 65)

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Functions
Slow sync
The camera slows the shutter speed to capture both the subject and
background illumination. This is suitable for capturing the subject and
background illumination during the evening and night.
• Use of a tripod is recommended.
Red-eye reduction
The SB-500 fires 3 flashes at low output just before the picture is
taken to reduce the red-eye effect caused by the flash light.
Rear-curtain sync
Rear-curtain sync flash creates the effect of a smooth stream of light
behind the subject.
• A slow shutter speed is usually used. Use of a tripod is recommended.
Exposure compensation/Flash exposure compensation
Exposure and flash exposure can be compensated using settings on
the camera.