AF points in the pattern of 51 to maintain focus on the
bird. You press the Shutter-release button all the way down
and the images start pouring into your memory card. You
are panning with the bird, firing bursts until it moves out
of range. You’ve got the shot! (See chapter opening image
of the eagle by David Summers. This is a perfect example
of using AF and focus tracking successfully.)
Can you see how flexible Dynamic-area AF is, especially
when you adjust the patterns in Custom setting a3? If your
subject will only move a short distance (or is moving slowly),
you can simply select a pattern of 9 points. Maybe you’re
doing some macro shots of a bee on a flower and she is
moving around the flower. Or you might be photographing a
tennis game, in which case you could use 21 points to allow
for more rapid side-to-side movement without losing the
focus. You’ll have to decide which pattern best fits your
needs for the current shooting situation.
Using Dynamic-area AF and Custom setting a3, you can more
accurately track and photograph all sorts, sizes, and speeds of
moving subjects. The reaction speed of the AF system is
somewhat slower when using either of the two 51 point
modes since there is a lot more information being processed
by the camera. Take that into consideration when shooting
events. The mode called 51 points (3D-tracking) adds
color-detection
ability to the tracking system. The camera will not only track
by subject area, it will also remember the color of the subject
as an additional tracking mechanism.
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