Nikon d3s User Manual (en)

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U
Choose the function assigned to the 
button for vertical shooting.
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.
AF lock only
Focus locks while the 
B button is pressed.
a10: Vertical AF-ON Button
G button
➜ A Custom Settings menu
Option
Description
Same as AF-ON
Both 
B buttons perform the function selected 
for Custom Setting a9.
AF-ON
Pressing the vertical 
B button initiates 
autofocus.
AE/AF lock
Focus and exposure lock while the vertical 
button is pressed.
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.
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.
AF lock only
Focus locks while the vertical 
B button is 
pressed.
Option
Description