Nikon D90 DX D90 User's Manual - Page 74
Focus, Autofocus
UPC - 018208254484
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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 Focus mode selector focuses automatically when the shutter-release h 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: 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. For stationary subjects. Focus locks when shutter-release button AF-S Single-servo AF is pressed halfway. Shutter can only be released when in-focus indicator is displayed. For moving subjects. Camera focuses continuously while AF-C Continuous-servo AF shutter-release button is pressed halfway. Photographs can be taken even when in-focus indicator is not displayed. To choose the autofocus mode, press the B button. The focus mode changes each time the B button is pressed. B button Main command dial Control panel 54