Nikon D90 - Manual (Page 140)

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D Active D-Lighting
Noise (grains, banding, mottling) may appear in photographs taken with Active D-Lighting at
high ISO sensitivities. The Brightness and Contrast Picture Control settings (pg. 111) can not
be adjusted while active D-Lighting is in effect. In exposure mode M, an Active D-Lighting
setting of Auto is equivalent to Normal.
D “Active D-Lighting” Versus “D-Lighting”
The Active D-Lighting option in the shooting menu adjusts exposure before shooting to
optimize the dynamic range, while the D-Lighting option in the retouch menu optimizes
dynamic range in images after shooting.
A ADL Bracketing
When ADL bracketing is selected for Custom Setting e4 (Auto bracketing set, pg. 191), the
camera will automatically vary Active D-Lighting over two photographs: the first will be taken
with the current setting for Active-D-Lighting, the second with Active D-Lighting off. See page
193 for more information.