Nikon D300 User Manual (en)

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274
U
a10: AF-On for MB-D10
Choose the function assigned to 
the 
B button on the optional 
MB-D10 battery pack.
Option
Description
A
AF-ON
(default)
Pressing the MB-D10 
B button initiates 
autofocus.
AE/AF lock
Focus and exposure lock while the MB-D10 
button is pressed.
AE lock only
Exposure locks while the MB-D10 
B button is 
pressed.
D
AE lock (Reset 
on release)
Exposure locks when the MB-D10 
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-D10 
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-D10 
B button is 
pressed.
G
Same as 
FUNC. button
The MB-D10 
B button performs the function 
selected for Custom Setting f4 (pg. 302).