Nikon D1X User Manual page 85

Autofocus
(continued)
The AF-ON Buttons
An alternative means of activating autofocus is to press the AF-ON button (A) or,
when the shutter-release button for vertical shooting is unlocked, the AF-ON button
for ver tical shooting (B). Either operation has the same effect as pressing the shut-
ter-release button halfway.
A B
4—AF Activation ( pg. 162)
Using this setting, the camera can be programmed so that an autofocus operation can only be
performed using the AF-ON buttons to avoid accidental shutter release.
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