Nikon D3S - Manual (Page 212)

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Using a Flash
The camera supports the Nikon Creative Lighting System (CLS) and
can be used with CLS-compatible flash units. Optional flash units
can be attached directly to the camera accessory shoe as described
below. The accessory shoe is equipped with a safety lock for flash
units with a locking pin, such as the SB-900, SB-800, SB-600, and
SB-400.
1
Remove the accessory shoe cover.
2
Mount the flash unit on the
accessory shoe.
See the manual provided with the flash
unit for details.
A
The Sync Terminal
A sync cable can be connected to the sync
terminal as required. Do not connect another
flash unit via a sync cable when performing rear-
curtain sync flash photography with a flash unit
mounted on the camera accessory shoe.