Nikon D70-series User Manual page 62

The AF-ON Button
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.
Predictive Focus Tracking
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.
a1—AF-C Mode Priority (
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 (
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 (
This option controls whether the camera immediately adjusts focus to track a subject when
the distance to the subject changes drastically.
a6—AF Activation (
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.
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