Nikon D3body D3 User's Manual - Page 101
Buttons, Predictive Focus Tracking, See Also, button for, vertical shooting
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A 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. B button N B button for vertical shooting A 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 shutterrelease 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 See Also For information on using focus priority in continuous-servo AF, see Custom Setting a1 ([AF-C priority selection], pg. 304). For information on using release priority in single-servo AF, see Custom Setting a2 ([AF-S priority selection], pg. 305). For information on preventing the camera from focusing when the shutter-release button is pressed halfway, see Custom Setting a5 ([AF activation], pg. 308). 75