Nikon Camera N90 - Manual (Page 48)

The Wide-Area focus brackets delineate the focus detecting
area in the viewfinder. Subjects of sufficient brightness and
detaii can be detected within these brackets. In addition to
general photography, autofocus using Wide-Area focus
brackets is suited to action photography in which the moving
subject requires a wide-range focus detection area.
However, focus detection may not be possible if the subject is
too small to fully cover the Wide-Area focus brackets. If various
subjects, each at a different distance, fall within the focus
detection area, focus will be confirmed for a single subject as
follows:
•For subjects of equal brightness: the closer one will be
focused.
•For subjects of unequal brightness: the brighter one will be
focused.
Spot Area AF, in which the focus detecting area is shown by
the 3mm-dia. circle at the center of the viewfinder, is
recommended in the following situations:
a. Subject considerably
smaller than the Wide-Area
focus brackets*
b . Subject obscured by an
object, such as a fence, in
the foreground
. A particular portion of the
subject must be in focus,
such as the eyes in a
portrait
d . Strongly backlit subject,
such as someone standing
beside bright window**
* Use focus lock. See ’AUTOFOCUS WITH MAIN SUBJECT OFF CENTER" on pages 40 to 43.
•* To give correct exposure on your subject, see ‘AE-L LEVER" on pages 88 to 89 or "TO OBTAIN METER READING FOR A
PARTICULAR SUBJECT IN MANUAL EXPOSURE MODE" on pages 90 to 91.
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