Nikon D200 Брошура - Сторінка 10

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Nikon D200 Брошура
Overlap Servo Autofocus
Some subjects move too erratically to be tracked by many autofocus
systems. In order to have the best chance to capture your subject, one
needs continuous focus detection until the last possible moment. In
Continuous Servo AF with Focus Tracking, the Multi-CAM 2000 AF
sensor continues focus detection even while the lens is in motion (lens
driving). As a result, the focus is constantly being tuned and retuned
during a burst of pictures. The result: sharper shots of moving subjects
than any other system.
Conventional servo autofocus system
1st
Focus
Compu-
Lens
Focus
detection
tation
drive
detection
Nikon's overlap servo autofocus system
1st
Focus
Compu-
Lens
detection
drive
tation
Focus
Compu-
detection
tation
2nd
Focus is detected more frequently than conventional systems within the same period of
time, ensuring consistently sharp focus, frame after frame.
Overlap Servo captures a focused image of even fast-moving subjects.
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2nd
3rd
Compu-
Lens
Focus
Compu-
tation
drive
detection
tation
3rd
Lens
drive
Focus
Compu-
Lens
detection
tation
drive
Focus
Compu-
detection
tation
4th
© Foto Natura
Once the camera detects a moving subject, the autofocus system
activates Focus Tracking so it can better anticipate subject movement
until the moment of exposure. (Shutter release time lag is also
considered.) Even if focus detection is momentarily interrupted — if
your subject moves out of the focus area or if another object comes
between the camera and the main subject — Focus Tracking with
Lock-On will continue to track the subject, maintaining sharp focus for
each subsequent frame. And with the latest Nikon D2xs and D200, one
can even adjust the length of time Focus Tracking will stay locked onto
your subject, should it be momentarily obscured.
Lens
drive
Lens
drive
Focus Tracking with Lock-On
© Noriyuki Yuasa
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