Nikon D200OUTFIT manual AF-ON Button, Predictive Focus Tracking, A1-AF-C Mode Priority, A5-Lock-On

Reference—Focus

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The AF-ON Button

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

Predictive Focus Tracking

In continuous-servo AF, the camera will automatically initiate predictive focus tracking if the subject moves while the shutter-release button is pressed halfway or the AF-ONbut- ton is pressed. In predictive focus tracking, the camera will track focus while attempting to predict where the subject will be when the shutter is released.

a1—AF-C Mode Priority ( 148)

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.

a2—AF-S Mode Priority ( 148)

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.

a5—Lock-On ( 150)

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

a6—AF Activation ( 151)

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