Nikon D90 - Manual (Page 65)

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Choose the focus point.
Wide and normal area autofocus : Rotate the focus
selector lock to “ J” and use the multi selector to
move the focus point to any point in the frame.
Return the focus selector lock to “L” when
selection is complete.
Face-priority autofocus : A double yellow border will
be displayed when the camera detects a portrait
subject facing the camera (if multiple faces, up
to a maximum of five, are detected, the camera
will focus on the closest subject).
Manual focus : Use the multi selector to choose the
focus point for electronic rangefinding (pg. 59)
as described for wide and normal area
autofocus, above.
5
Focus.
Autofocus : In wide and normal area autofocus, the
camera will focus while the shutter-release
button is pressed halfway. In face-priority
autofocus, the camera sets focus and exposure
for the face in the double yellow border while
the shutter-release button is pressed halfway; if
the camera can no longer detect the subject
(because, for example, the subject has looked
away), borders will no longer be displayed. The
focus point will blink green and the monitor
may brighten or darken while the camera
focuses. If the camera is able to focus, the focus point will be displayed in green;
if the camera is unable to focus, the focus point will blink red. Note that pictures
can be taken even when the focus point blinks red, and that single-servo
autofocus is used regardless of the option selected for autofocus mode (pg. 54).
Check focus in the monitor before shooting.
Exit
Focus selector lock
Focus point
Exit
Focus point
Exit
Exit