Nikon D300s manual For the purpose of focusing the camera, Predictive Focus Tracking

AThe BButton

For the purpose of focusing the camera,	Bbutton
pressing the Bbutton 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.

APredictive 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 the Bbutton is pressed. This allows the camera to track focus while attempting to predict where the subject will be when the shutter is released.

ASee Also

For information on using focus priority in continuous-servo AF, see Custom Setting a1 (AF-C priority selection, 0 263). For information on

using release priority in single-servo AF, see Custom Setting a2 (AF-S priority selection, 0 264). For information on preventing the camera

from focusing when the shutter-release button is pressed halfway, see Custom Setting a5 (AF activation, 0 266).

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