Nikon D3x ユーザーズマニュアル

75

N

A

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.

A

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.

A

For information on using focus priority in continuous-servo AF, see 
Custom Setting a1 ([AF-C priority selection], pg. 305).

 

For information on 

using release priority in single-servo AF, see Custom Setting a2 ([AF-S 
priority selection], pg. 306).

 

For information on preventing the camera 

from focusing when the shutter-release button is pressed halfway, see 
Custom Setting a5 ([AF activation], pg. 309).

B button

B button for 
vertical shooting