Nikon D300s User Manual

Page 101

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.

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.

See 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).

B button