Nikon D3400 Triple Lens Parent's Kit Owner's Manual

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P, S, A, and M Modes
Active D-Lighting
Active D-Lighting preserves details in highlights and shadows, 
creating photographs with natural contrast. Use for high 
contrast scenes, for example when photographing brightly lit 
outdoor scenery through a door or window or taking pictures of 
shaded subjects on a sunny day. Active D-Lighting is not 
recommended in mode M; in other modes, it is most effective 
when used with 
L (Matrix metering; 0 111).
1
Display Active D-Lighting options.
Press the 
P button, then highlight 
Active D-Lighting in the information 
display and press 
J.
Preserving Detail in Highlights and 
Shadows
Active D-Lighting: Off
Active D-Lighting: On
P button