Nikon D810 - Manual (Page 336)

312
Choose whether separate focus points can be selected for
“wide” (landscape) orientation, for “tall” (portrait) orientation
with the camera rotated 90 ° clockwise, and for “tall” orientation
with the camera rotated 90 ° counterclockwise.
Select Off to use the same focus point and AF-area mode
regardless of camera orientation.
Choose Focus point to enable separate focus-point selection, or
Focus point and AF-area mode to enable separate selection of
both the focus point and the AF-area mode.
a9: Store by Orientation
G
button ➜ A Custom Settings menu
Camera rotated 90 °
counter-clockwise
Landscape (wide)
orientation
Camera rotated 90 °
clockwise
Camera rotated 90 °
counter-clockwise
Landscape (wide)
orientation
Camera rotated 90 °
clockwise