Nikon D300 User Manual page 123

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 263). When a flash is used,
the value selected for [Minimum shutter speed] is ignored in favor of the
option selected for Custom Setting e1 ([Flash sync speed], pg. 288).
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 g or h
and choose a larger aperture.
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