Nikon D3S User Manual

Page 117

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; note, however, that vibration
reduction (available with VR lenses) can only
be engaged by pressing the shutter-release
button halfway.

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 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.

See Also

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

0 295).

For information on

using release priority in single-servo AF, see Custom Setting a2 (AF-S
priority selection,

0 296).

For information on preventing the camera

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

0 298).

B button

B button for

vertical shooting