Nikon D800 User Manual (en)

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U
Choose the function assigned to the 
B button on the optional 
MB-D12 battery pack.
f13: Assign MB-D12 AF-ON
G button
➜ A Custom Settings menu
Option
Description
AF-ON
Pressing the MB-D12 
B button initiates autofocus.
FV lock
Press the MB-D12 
B button to lock flash value 
(built-in flash and compatible optional flash units only, 
0 190, 382). Press again to cancel FV lock.
AE/AF lock
Focus and exposure lock while the MB-D12 
button is pressed.
AE lock only
Exposure locks while the MB-D12 
B button is 
pressed.
D
AE lock (Reset 
on release)
Exposure locks when the MB-D12 
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 MB-D12 
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 MB-D12 
B button is pressed.
G
Same as Fn 
button
The MB-D12 
B button performs the function 
selected for Custom Setting f4 (