Nikon D40 manual Focus Mode, Focus mode Description, AF-Assist Illuminator

Focus

Focus can be adjusted automatically (see “Focus Mode,” below) or manually ( 28). The user can also select the focus area for automatic or manual focus ( 24, 25) or use focus lock to focus to recompose photographs after focusing ( 26).

Focus Mode

Controls used

Choose how the camera focuses. AF-Sand AF-Care available only in P, S, A, and M modes.

	Focus mode	Description
	Auto-servo AF	Camera automatically selects single-servo autofocus when subject is judged
AF-A		to be stationary, continuous-servo autofocus when subject is judged to be
	(default setting)	moving.
AF-S	Single-servo AF	For stationary subjects. Focus locks when shutter-release button is pressed
		halfway.
		For moving subjects. Camera focuses continuously while shutter-release but-
AF-C	Continuous-	ton is pressed halfway.	Priority is given to shutter response, meaning that
	servo AF	shutter may sometimes be released before in-focus indicator (z) is displayed
		in viewfinder.
MF	Manual focus	User focuses manually (	28).

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. The AF-assist illuminator will not light in continuous- servo AF or manual focus mode, in , or modes, or if the center focus area is not selected or if Off has been selected for Custom Setting 9 (AF assist). The illuminator has a range of about 0.5–3.0m (1ft. 8in.–9ft. 10in.); when using the illuminator, use a lens with a focal length of 24– 200mm and remove the lens hood.

2—Focus Mode ( 75)

Focus mode can also be selected from the Custom Settings menu.

Reference: More on Photography (All Modes)/Focus

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