Nikon D3S - Manual (Page 219)

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Flash Modes
The camera supports the following flash modes:
Flash mode Description
Front-curtain
sync
This mode is recommended for most situations. In
programmed auto and aperture-priority auto modes,
shutter speed will automatically be set to values
between
1 /
250
and 1 /
60
s ( 1 /
8,000
to 1 /
60
s with Auto FP
High-Speed Sync; 0 311).
Slow sync
Flash is combined with shutter speeds as slow as 30 s to
capture both subject and background at night or under
dim light. This mode is only available in programmed
auto and aperture-priority auto exposure modes. Use of
tripod is recommended to prevent blurring caused by
camera shake.
Rear-curtain
sync
In shutter-priority auto or manual exposure mode, flash
fires just before the shutter closes. Use to create effect of
a stream of light behind moving objects. In
programmed auto and aperture-priority auto, slow rear-
curtain sync is used to capture both subject and
background. Use of tripod is recommended to prevent
blurring caused by camera shake.
Red-eye
reduction
In this mode (available only with SB-900, SB-800, SB-600,
and SB-400), red-eye reduction pre-flash lights for
approximately one second before main flash. Pupils in
subject’s eyes contract, reducing “red-eye” effect
sometimes caused by flash. Owing to one-second
shutter-release delay, this mode is not recommended
with moving subjects or in other situations in which
quick shutter response is required. Avoid moving camera
while red-eye reduction pre-flash is lit.
Red-eye
reduction with
slow sync
Combines red-eye reduction with slow sync. Use for
portraits taken against a backdrop of night scenery.
Available only with SB-900, SB-800, SB-600, and SB-400 in
programmed auto and aperture-priority auto exposure
modes. Use of a tripod is recommended to prevent
blurring caused by camera shake.