Nikon D700 User Manual page 99

Choose single-servo AF for landscapes and other stationary sub-
jects. Continuous-servo AF may be a better choice with erratically-
moving subjects. Manual focus is recommended when the camera
is unable to focus using autofocus.
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The B Button
Autofocus can also be activated by pressing the
B button.
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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 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.
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See Also
For information on using focus priority in continuous-servo AF, see
Custom Setting a1 (AF-C priority selection, pg. 283). For information on
using release priority in single-servo AF, see Custom Setting a2 (AF-S
priority selection, pg. 284). For information on preventing the camera
from focusing when the shutter-release button is pressed halfway, see
Custom Setting a5 (AF activation, pg. 287).
B button
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