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U
Choose the function assigned to the B
button for vertical shooting.
E AE lock (Hold)
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.
F AF lock only Focus locks while the B button is pressed.
a10: Vertical AF-ON Button
G button ➜ ACustom Settings menu
Option Description
G Same as AF-ON
Both B buttons perform the function selected
for Custom Setting a9.
A AF-ON
Pressing the vertical B button initiates
autofocus.
B AE/AF lock
Focus and exposure lock while the vertical B
button is pressed.
C AE lock only
Exposure locks while the vertical B button is
pressed.
D
AE lock (Reset on
release)
Exposure locks when the vertical 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.
E AE lock (Hold)
Exposure locks when the vertical B 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 vertical B button is
pressed.
Option Description