Nikon D850 Menu Manual page 139

The functions that can be assigned to these controls are as
follows:
J
Choose image area
$
Shutter spd & aperture lock
v
1 step spd/aperture
w
Choose non-CPU lens number
y
Active D-Lighting
z
Exposure delay mode
n
Photo shooting menu bank
v
Exposure mode
m
White balance
t
Auto bracketing
$
Multiple exposure
2
HDR (high dynamic range)
None
The following options are available:
Option
Choose image
J
area
Shutter spd &
$
aperture lock
Option
Press the control and
rotate a command dial
to choose from pre-
selected image areas
(0 45). Selecting
Choose image area
displays a list of image
areas; highlight options and press 2 to select or
deselect, then press J.
Press the control and rotate the main command
dial to lock shutter speed in modes S and M; press
the control and rotate the sub-command dial to
lock aperture in modes A and M.
1 w 9 n Q
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139
Menu Guide