Nikon D850 User Manual page 325

❚❚ The Shutter-Release Button, Multi Selector, and Command Dials
These controls perform the
Shutter-release
same functions as the
button Multi selector
matching controls on the
camera body, with the
exception that, regardless
of the option chosen for
Custom Setting f5 (Multi
selector, 0 269), the
MB-D18 multi selector
Sub-command Main command
dial dial
cannot be used to start the
standby timer.
❚❚ The Fn and AF-ON Buttons
The functions performed by
these controls can be
selected using Custom
Setting f10 (Assign
MB-D18 buttons, 0 270).
Fn button AF-ON button
❚❚ The MB-D18 Control Lock
The control lock locks the
controls on the MB-D18 to
prevent unintended use.
Before using these controls
to take photographs in "tall"
(portrait) orientation,
Locked Unlocked
release the lock as shown.
The control lock is not a
power switch. Use the camera power switch to turn the camera
on and off.
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