Nikon D810 - Manual (Page 397)

373
Photographs taken while On is selected contain information on
camera orientation, allowing them to be rotated automatically
during playback (0 288) or when viewed in ViewNX 2 (supplied)
or in Capture NX-D (available for download; 0 260). The
following orientations are recorded:
Camera orientation is not recorded when Off is selected.
Choose this option when panning or taking photographs with
the lens pointing up or down.
Auto Image Rotation
G
button ➜ B setup menu
Landscape (wide)
orientation
Camera rotated 90 °
clockwise
Camera rotated 90 °
counter-clockwise
A
Rotate Tall
To automatically rotate “tall” (portrait-orientation) photographs for
display during playback, select On for the Rotate tall option in the
playback menu (0 288).