Focusing - Nikon Z9 Settings Manual

Focusing

Before initiating auto capture, we recommend that you focus at the
distance you anticipate the subject will be. The focus distance can
be set by positioning the focus-point target over your subject and
pressing the AF-ON button or pressing the shutter-release button
halfway. Once auto capture is initiated, the camera will stay focused
at this distance while standing by, helping it focus quickly when the
subject is detected.
Focus-point target
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"Capture Criteria" > "Motion"