Nikon D200 Manuel D’Utilisation

For the purpose of focusing the camera, pressing the AF-
ON button has the same eff ect as pressing the shutter-re-
lease button halfway.

In continuous-servo AF, the camera will au to mat i cal ly ini tiate pre dic tive focus track ing if 
the subject moves while the shutter-release button is pressed halfway or the AF-ON but-
ton is pressed.  In predictive focus tracking, the camera will track focus while at tempt ing 
to predict where the subject will be when the shutter is re leased.

If  Focus  is selected for Custom Setting a1 (AF-C Mode Priority), photographs can be 
taken in continuous servo-AF only when the camera is in focus.  Note that regardless of the 
setting selected, focus will not lock when the in-focus indicator is displayed.

If Release is selected for Custom Setting a2 (AF-S Mode Priority), photographs can be 
taken in single servo-AF even when the camera is not in focus.  Note that regardless of the 
setting selected, focus will lock when the in-focus indicator is displayed.

This option controls whether the camera immediately adjusts focus to track a subject when 
the distance to the subject changes drastically.

If  AF-ON Only is selected for Custom Setting a6 (AF Activation), the camera will only 
focus when the AF-ON button is pressed, not when the shutter-release button is pressed 
halfway.