Most importantly, the
camera measures the distance to the subject in the autofocus zone (usually the center
of the viewfinder) and locks focus. As long as you keep some pressure on the shutter
release, you??™re now free to reposition the camera and compose the shot any way you
like. When the scene is composed to your liking, just press down the rest of the way
to capture the photo. Focus lock is a common and powerful way to lock the focus on
a person, then recompose slightly to put him or her in the rule of thirds sweet spot.
?– Use focus zones Many cameras??”especially models with multisegment metering
(see Chapter 3 for an explanation of that)??”let you control what part of the
viewfinder is used as the focusing zone. Instead of focusing from the center and
using focus lock to recompose the shot, you can use a control on the back of the
camera to tell the camera to focus using a zone on the right, left, top, or bottom of
the viewfinder, like the ones depicted in the following viewfinder illustration. That
way, you never need to focus lock and recompose. Just set the active focus zone over
the subject and take the shot. With practice, you can change focus zones using your
thumb without ever looking away from the scene in the viewfinder.
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