AThe E Button

Exposure compensation can also be set by pressing the E button and rotating the command dial. The selected value is shown in the viewfinder and information display.

Ebutton Command dial

 

–0.3 EV

+2 EV

AMode M

In mode M, exposure compensation affects only the exposure indicator; shutter speed and aperture do not change.

AUsing a Flash

When a flash is used, exposure compensation affects both background exposure and flash level.

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Nikon D3100 2 manual E Button, Mode M, Using a Flash