Nikon D1 - Manual (Page 53)

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Note
Manual Focus
Manual focus can be used in situations in which autofocus will not produce the
expected results, or when the lens attached to the camera is not an AF Nikkor
lens.
B
To use manual focus, set the focus mode selector to M (A). Adjust focus using
the lens focusing ring (B) until the image displayed on the clear matte field in
the viewfinder is in focus.
Using the electronic range finder
A B
Set the focus mode selector to M and half-press the shutter-release button.
Before the focus indicator in the viewfinder disappears, rotate the lens focusing
ring (A) until the in-focus indicator (
● ) is displayed.
If the indicator appears in the viewfinder, the camera is focused on a point
between the camera and the subject. The indicator appears when the
camera is focused on a point behind the subject. Note that a photograph can
be taken even when the in-focus indicator is not displayed in the viewfinder.
A
Camera Settings: Manual Focus
The D1’s built-in electronic range finder is compatible with most Nikkor lenses
(including AF Nikkor lenses when used with manual focus) with a maximum aperture
of f/5.6 or faster, and can be used when focusing on subjects in any of the five focus
areas (see “Focus Area,” above).