Focus; Autofocus - Nikon D850 User Manual

Focus

This section describes the focus options available when
photographs are framed in the viewfinder. Focus can be
adjusted automatically (0 94) or manually (0 111). The user can
also select the focus point for automatic or manual focus
(0 105) or use focus lock to focus and recompose photographs
after focusing (0 108).

Autofocus

To use autofocus, rotate the
focus-mode selector to AF.
The camera focuses using 153 focus
points, of which the 55 shown by r in
the illustration can be selected by the
user (0 105).
94
Focus-mode selector
User-selectable focus
points