Nikon D3 - Manual (Page 137)

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A
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 299). Foreground subjects
may be underexposed in photos taken with a flash at slow shutter speeds,
in daylight, or against a bright background. Choose a flash mode other
than slow sync or select exposure mode g or h and choose a larger
aperture.