Nikon D300S - Page 101

B The AF-ON Button
For the purpose of focusing the camera,
pressing
the AF-ON 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 Predictive Focus Tracking
In continuous-servo AFt 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 AF-ON button is pressed. This
allows
the camera to track focus while attempting to predict where the
subject will be when the shutter is released.
B See Also
For information on using focus priority in continuous-servo AFt see
Custom Setting a1 (AF-C priority selection, CD 263). For information on
using release
priority in single-servo AF, see Custom Setting a2 (AF-S
priority selection,
0264). For information on preventing the camera
from focusing when the shutter-release button is pressed halfway, see
Custom Setting as (AF activation, 0 266).
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