81
ADVANCED OPERATIONS
DEPTH OF FIELD
Depth of field refers to the range around the opti-
mum focusing point of the subject in which the ele-
ments at different distances are in focus. The
depth of field increases as the aperture is closed
down, the focal length of the lens becomes short-
er, or the subject is positioned farther away.
81
The Range Allowed for Focusing
The in-focus range varies depending on the aper-
ture in use. Zoom lenses do not have a depth-of-
field scale for mechanical considerations.
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