Nikon D300S D300S User's Manual - Page 101
Button, Predictive Focus Tracking, See Also, AF-C priority selection, AF activation, Custom Setting a1
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A The B Button For the purpose of focusing the camera, pressing the B button 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. B button 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 the B button 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 N 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). 75