Nikon D810 - Manual (Page 162)

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Exposure Bracketing
The camera modifies exposure by varying shutter speed and aperture
(programmed auto), aperture (shutter-priority auto), or shutter speed
(aperture-priority auto, manual exposure mode). If On is selected for
ISO sensitivity settings > Auto ISO sensitivity control (0 111) in
modes e, f, and g, the camera will modify exposure by varying ISO
sensitivity and only vary shutter speed and/or aperture if the limits of
exposure system are exceeded. Custom Setting e7 (Auto bracketing
(mode M), 0 339) can be used to change how the camera performs
exposure and flash bracketing in manual exposure mode. Bracketing
can be performed by varying flash level together with shutter speed
and/or aperture, or by varying flash level alone.