Nikon D800 User Manual (en)

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U
Choose the role played by the Fn button, 
either by itself (Fn button press) or when 
used in combination with the command dials 
(Fn button + command dials).
❚❚Fn button press
Selecting Fn button press displays the following options:
f4: Assign Fn Button
G button
➜ A Custom Settings menu
Option
Description
q
Preview
*
Press the Fn button to preview depth of field (
r
FV lock
*
Press the Fn button to lock flash value (built-in flash and 
compatible optional flash units only, 
0 190, 382). Press 
again to cancel FV lock.
B
AE/AF lock
Focus and exposure lock while the Fn button is pressed.
C
AE lock only
Exposure locks while the Fn button is pressed.
D
AE lock 
(Reset on 
release)
*
Exposure locks when the Fn button is pressed, and 
remains locked until the button is pressed a second 
time, the shutter is released, or the exposure meters 
turn off.
E
AE lock 
(Hold)
*
Exposure locks when the Fn button is pressed, and 
remains locked until the button is pressed a second 
time or the exposure meters turn off.
F
AF lock only
Focus locks while the Fn button is pressed.
A
AF-ON
*
Pressing the Fn button initiates autofocus.
s
Flash off
The flash will not fire in photos taken while the Fn 
button is pressed.