Nikon D700 - Manual (Page 410)

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Flash Contacts
The D700 is equipped with an accessory shoe for attaching
optional flash units directly to the camera and a sync terminal that
allows flash units to be connected via a sync cable.
❚❚The Accessory Shoe
Use the accessory shoe to mount optional
flash units directly on the camera without a
sync cable (pg. 378). The accessory shoe is
equipped with a safety lock for Speedlights
with a locking pin, such as the SB-900, SB-800,
SB-600 and SB-400.
❚❚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.
D ISO Sensitivity
When auto ISO sensitivity control is on (pg. 108), ISO sensitivity will
automatically be adjusted as required for optimal flash output when an
optional SB-900, SB-800, SB-600, or SB-400 flash unit is attached. This may
result in foreground subjects being underexposed in photographs taken
with the flash at slow shutter speeds, in daylight, or against a bright
background. In these cases, choose a flash mode other than slow sync or
choose a larger aperture.