Nikon D3100 - Manual (Page 102)

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Active D-Lighting
Noise (randomly-spaced bright pixels, fog, or lines) may appear in photographs taken with
Active D-Lighting. Uneven shading may be visible with some subjects.
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“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 (
0 153)
optimizes dynamic range in images after shooting.
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The Shooting Menu
Active D-Lighting can also be adjusted using the Active D-Lighting
option in the shooting menu (
0 131).
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See Also
For information on using the Fn button and command dial to turn Active D-Lighting on and
off, see page 146.