Nikon D90 - Manual (Page 74)

54
h
Focus
Focus can be adjusted automatically (see “Autofocus,” below) or manually (pg. 59).
The user can also select the focus point for automatic or manual focus (pg. 59) or use
focus lock to focus to recompose photographs after focusing (pg. 57).
Autofocus
When the focus mode selector is set to AF, the camera
focuses automatically when the shutter-release
button is pressed halfway. In single-point AF, a beep
will sound when the camera focuses. No beep will
sound when AF-A is selected in
m (sports) mode or
when continuous-servo autofocus is used (note that
continuous-servo autofocus may be selected
automatically when shooting moving subjects in AF-A autofocus mode).
With lenses that offers A-M selection, select A when using autofocus. With lenses that
support M/A (autofocus with manual priority), select M/A. If the lens does not support
autofocus or the camera is unable to focus using autofocus, use manual focus
(pg. 59).
❚❚Autofocus Mode
The following autofocus modes are available when the focus mode selector is set to
AF
:
To choose the autofocus mode, press the B button. The focus mode changes each
time the B button is pressed.
Autofocus mode Description
AF-A
Auto select
(default setting)
Camera automatically selects single-servo autofocus when
subject is stationary, continuous-servo autofocus when subject is
moving. Shutter can only be released if camera is able to focus.
AF-S Single-servo AF
For stationary subjects. Focus locks when shutter-release button
is pressed halfway. Shutter can only be released when in-focus
indicator is displayed.
AF-C Continuous-servo AF
For moving subjects. Camera focuses continuously while
shutter-release button is pressed halfway. Photographs can be
taken even when in-focus indicator is not displayed.
Focus mode selector
B button Main command dial Control panel