Nikon SB-900 - Manual (Page 106)

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Flash modes and functions
Available functions to be set on the camera
Red-eye reduction/Red-eye reduction with slow-sync fl ash
To prevent your subject’s eyes from appearing red in color pictures shot in dim light,
the SB-900 fires three flashes at reduced output just before the picture is taken.
In the Red-eye reduction with slow sync flash, red-eye reduction is combined
with slow-sync flash.
Since slow shutter speeds are normally used in red-eye reduction with slow-sync
flash, use of a tripod is recommended to prevent camera shake.
Rear-curtain sync
In normal flash photography, when shooting fast-moving subjects at slow shutter
speeds, unnatural-looking pictures can occur, because the subject frozen by the
flash appears behind or within the blurred movement (see photo below right).
Rear-curtain flash sync creates a picture in which the blur of a moving subject (for
example, the taillights of a car) appears behind the subject and not in front.
In front-curtain sync, the fl ash fi res immediately after the front curtain opens
completely; in rear-curtain sync, the fl ash fi res just before the rear curtain starts
to close.
Since slow shutter speeds are usually used, use a tripod to prevent camera shake.
This function does not operate in Repeating fl ash operation.
In multiple fl ash, the master fl ash unit can be set to either front-curtain or rear-
curtain sync fl ash. However, the remote units cannot be set to rear-curtain sync
fl ash. (kD-39)
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Front-curtain sync Rear-curtain sync