A9: Af-On Button - Nikon D3X User Manual

a9: AF-ON Button

Choose the function performed when the
B button is pressed.
Option
B
A
(default)
B AE/AF lock
C AE lock only Exposure locks while the B button is pressed.
AE lock
D
(Reset on
release)
AE lock
E
(Hold)
F AF lock only Focus locks while the B button is pressed.
U
312
Pressing the B button initiates autofocus.
Focus and exposure lock while the B button is
pressed.
Exposure locks when the B button is pressed, and
remains locked until the button is pressed a second
time, the shutter is released, or the exposure meters
turn off.
Exposure locks when the B button is pressed, and
remains locked until the button is pressed a second
time or the exposure meters turn off.
Description