Nikon D300 User Manual (en)

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f4: Assign FUNC. Button
Choose the role played by the Fn button, 
either by itself ([FUNC. button press]) or 
when used in combination with the 
command dials ([FUNC. button+dials]).
❚❚FUNC. Button Press
Selecting [FUNC. button press] for Custom Setting f4 displays the 
following options:
Option
Description
q
Preview
*
Press the Fn button to preview depth of field 
(pg. 103).
r
FV lock
*
Press the Fn button to lock flash value (built-in flash 
and SB-900, SB-800, SB-600, SB-400, and SB-R200 
flash units only, pg. 178). 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.
s
Flash off
The flash will not fire in photos taken while the Fn 
button is pressed.