Nikon D2x manual How it works

How it works	When to use it
Camera focuses on subject in selected focus area.	Use with static subjects when
Focus will remain locked while shutter-release button	time is available to compose
is pressed halfway.	photo.
Camera focuses on subject in selected focus area. If
subject moves before camera has focused, camera	Use with static subjects when
will focus based on information from other focus	time is available to compose
areas. Focus will remain locked while shutter-release	photo.
button is pressed halfway.
As above, except camera focuses on subject in center	Use when sure of subject’s
focus area of selected group. If subject moves before	place in	overall	composition
camera has focused, camera will focus based on in-	but unsure of its exact posi-
formation from other focus areas in same group.	tion.
As above, except that camera selects focus area con-	Use when sure that subject
taining subject closest to camera. If subject moves	will be closest object to cam-
before camera has focused, camera will focus based	era but unsure where it will
on information from other focus areas.	appear in final composition.
Camera continues to focus on subject in selected	Use with moving subjects that
focus area while shutter-release button is pressed	can be continuously			framed
halfway.	in single focus area.
Camera focuses on subject in selected focus area.
While shutter-release button is pressed halfway, cam-	Use with subjects that are
era tracks subject as it moves from one focus area to	moving unpredictably.
the next.
	Use when sure of moving
As above, except camera focuses on subject in center	subject’s	place	in	overall
focus area of selected group.	composition but unsure of its
	exact position.
	Use with	erratically		moving
As above, except that camera selects focus area con-	subjects	when	you	know
taining subject closest to camera.	subject will be closest object
	to camera.

Taking Photographs—Focus

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