Nikon D1 - Manual (Page 29)

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6 .5 Set the focus mode to S (single servo AF)
Autofocus
Turn the focus mode selector until it clicks into place pointing to S
(single servo AF). For more information on focus settings, see “Camera
Settings.”
6 .6 Set the AF area mode to single area AF
Hold down the AF area mode button (A) and turn the main command
dial (B). Stop when [ ] (single area AF) appears in the control panel on
top of the camera (C). AF area mode is detailed in “Camera Settings:
AF Area Mode.”
First Steps: Take a Photograph
A B C
In autofocus (AF) mode, the camera focuses automatically when the shutter-release
button is pressed half way, or when the AF start button is pressed. Two autofocus
modes are available: S (single-servo AF) and C (continuous AF). In single-servo AF,
the shutter can only be released when the camera is in focus.
Do not use the focus ring when autofocus is in effect.
Autofocus can be set to start only when the AF start button is pressed (see
“Custom Settings,” item 4).