Nikon D1 - Manual (Page 109)

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Flash Sync Modes
Five sync modes are available:
Front-curtain sync: This mode is recommended in most situations.
When using the SB-26, SB-25, or SB-24, set the sync mode selector
on the Speedlight to NORMAL.
Slow sync: A lower shutter speed is used in programmed auto and
aperture-priority auto exposure modes to bring out background
details.
Rear-curtain sync: Use this mode to suggest motion by creating a
stream of light that appears to follow moving objects. When this
mode is combined with programmed auto or aperture-priority auto,
shutter speed is slowed to achieve the same effect as slow sync.
When using the SB-26, SB-25, or SB-24, set the Speedlight’s sync
mode selector to REAR.
Red-eye reduction: In this mode, a red-eye reduction pre-flash
lights for approximately one second before the main flash, causing
the pupils in your subjects’ eyes to contract and reducing the “red-
eye” effect a flash can sometimes cause.
Red-eye reduction with slow sync: This mode combines red-eye
reduction with slow sync (available only with SB-28DX, SB-28, SB-
27, and SB-26). Set the exposure mode to programmed auto or
aperture-priority auto.
Notes
Flash Photography: Flash Sync Modes
To prevent blurring caused by camera shake, use of a tripod is recommended with slow
sync or red-eye reduction with slow sync.
Rear-curtain sync can not be used with a studio flash system.
When red-eye reduction is used, there is a one-second delay between your fully
pressing the shutter-release button and the shutter being released. Be careful not to
move the camera or to let your subject move during this time. Red-eye reduction works
best when your subject is well within the range of the flash and is fully turned to face
the camera.