Nikon D330018-55VR User Manual (en)

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The AF-Assist Illuminator 
If the subject is poorly lit, the AF-assist 
illuminator will light automatically to assist 
the autofocus operation when the shutter-
release button is pressed halfway (some 
restrictions apply; 
0 331). Note that the 
illuminator may become hot when used 
multiple times in quick succession and will 
turn off automatically to protect the lamp 
after a period of continuous use. Normal 
function will resume after a brief pause.
AF-assist illuminator