Nikon D4S - Manual (Page 359)

337
U
Choose the role played by the Fn button,
either by itself (Press) or when used in
combination with the command dials
(Press + command dials).
❚❚Press
Selecting Press displays the following options:
f3: Assign Fn Button
G button
➜ A Custom Settings menu
Option Description
q
Preview
During viewfinder photography, you can preview
depth of field while the Fn button is pressed (
0 126).
During live view photography, you can press the
button once to open the lens to maximum aperture,
making it easier to check focus; pressing the button
again restores aperture to its original value (
0 54).
r
FV lock
Press the Fn button to lock flash value (supported
flash units only,
0 196, 208). 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 standby timer
expires.
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 standby timer expires.
F
AF lock only Focus locks while the Fn button is pressed.
A
AF-ON Pressing the Fn button initiates autofocus.