Nikon D5100 Reference Manual - Page 59
The AF-Assist Illuminator, Single-point AF, Dynamic-area AF, 3D-tracking 11 points, Built-in AF-
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D The AF-Assist Illuminator If the subject is poorly lit, the AF-assist illuminator will light AF-assist illuminator automatically to assist the autofocus operation when the shutter- release button is pressed halfway. The AF-assist illuminator will not light: • In live view or during movie recording • During manual focus or if live view is off and continuous-servo autofocus is selected (AF-C selected for focus mode, or continuous-servo AF selected in AF-A focus mode) • If the center focus point is not selected in c (Single-point AF), d (Dynamic-area AF), or f (3D-tracking (11 points)) AF-area mode (0 42, 43) • In shooting modes in which the AF-assist illuminator can not be used (0 216) • If Off has been selected for Custom Setting a2 (Built-in AF-assist illuminator; 0 158) The illuminator has a range of about 0.5-3.0 m (1 ft. 8 in.-9 ft. 10 in.); when using the z illuminator, use a lens with a focal length of 18-200 mm and remove the lens hood. The AF- assist illuminator will turn off automatically to protect the lamp after a period of continuous use. Normal function will resume after a brief pause. Note that the illuminator may become hot when used multiple times in quick succession. A See Also For information on focusing in live view, see page 100. For information on using release priority in continuous-servo AF, see Custom Setting a1 (AF-C priority selection, 0 158). Custom Setting d1 (Beep; 0 161) can be used to turn the beep speaker on or off. 41