Nikon 6MB07411-03 User Manual (en)

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The 
B Buttons
For the purpose of focusing the camera, 
pressing either of the 
B buttons has the 
same effect as pressing the shutter-release 
button halfway; note, however, that vibration 
reduction (available with VR lenses) can only 
be engaged by pressing the shutter-release 
button halfway.
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Predictive Focus Tracking
In continuous-servo AF, the camera will initiate predictive focus tracking 
if the subject moves toward or away from the camera while the shutter-
release button is pressed halfway or either of the 
B buttons is 
pressed.
 
This allows the camera to track focus while attempting to 
predict where the subject will be when the shutter is released.
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See Also
For information on using focus priority in continuous-servo AF, see 
Custom Setting a1 (AF-C priority selection
0 295).
 
For information on 
using release priority in single-servo AF, see Custom Setting a2 (AF-S 
priority selection
0 296).
 
For information on preventing the camera 
from focusing when the shutter-release button is pressed halfway, see 
Custom Setting a5 (AF activation
0 298).
B button
B button for
vertical shooting