Nikon D850 User Manual page 130

The focus selector lock can
be rotated to the locked (L)
position following
selection to prevent the
selected focus point from
changing when the multi
selector is pressed.
A
The Sub-selector
The sub-selector can be used in
place of the multi selector to
select the focus point. Focus and
exposure lock while the center
of the sub-selector is pressed
(0 108, 137). Use the sub-
selector as shown; pressing the
sides may not have the desired
effect. Be careful not to put your fingers or fingernails in your eye when
using the sub-selector.
A
Auto-area AF
The focus point for auto-area AF is selected automatically; manual
focus-point selection is not available.
106
Sub-selector