Nikon F100 - Manual (Page 35)

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About Depth of Field and Focus Tracking
This camera is equipped with autofocus where focusing is automatically
excuted by the camera. Basics of the relationship between focus and
depth of field and Focus Tracking are explained in this section.
• Depth of field
When focusing, depth of field should be considered. Depth of field is the zone
of sharpest focus in front of and behind the subject on which the lens is
focused. It varies according to shooting distance, focal length and, above all,
aperture. Smaller apertures (larger f-numbers) will produce a deeper depth of
field where the background and foreground become sharper; larger apertures
(smaller f-numbers) will produce a shallower depth of field where the
background becomes blurred. Similarly, shorter shooting distance or longer
focal length will produce a shallower depth of field, and longer shooting
distance or shorter focal length will produce a deeper depth of field. Note that
depth of field tends to be shallower in front of and deeper behind the subject in
focus.
• Focus Tracking
When the focus mode selector is set to Single Servo AF (S) or Continuous Servo
AF (C) and the shutter release button is lightly pressed or AF Start button is kept
pressed, the camera automatically switches to Focus Tracking when a moving
subject is detected. Focus Tracking enables the camera to analyze the speed of
the moving subject according to the focus data detected, and to obtain correct
focus by anticipating the subject’s position—and driving the lens to that
position—at the exact moment of exposure.
In Single Servo AF, Focus Tracking is activated with a subject that has been
moving in advance to the focus detection, and focus is locked when the subject
stops moving and / appears in the viewfinder. In Continuous Servo AF, camera
continues to track subject (even with a subject which started moving in the
middle of the focus detection) and focus is not locked.
CUSTOM SETTING
Using the Custom Setting feature, you can
create a combination of functions that are
different from the initial factory settings. The
functions listed in this section can be
selected with the F100.
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