Nikon D700 User Manual page 135

Pal
Auto ISO Sensitivity Control
Noise is more likely at higher sensitivities. Use the High ISO NR option in
the shooting menu to reduce noise (see page 278). Foreground subjects
may be underexposed in photos taken with the flash at slow shutter
speeds, in daylight, or against a bright background. Choose a flash mode
other than slow sync or select exposure mode A or M and choose a larger
aperture. Note that when the flash is used, the camera uses the shutter
speed selected for Custom Setting el (Flash sync Speed, pg. 305) in place
of the value selected for Minimum shutter speed.
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