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The lens aperture controls not only exposure, but also depth of field; the area between
the closest object in focus and the furthest object in focus. The larger the aperture
value, the greater the depth of field and the longer the shutter speed needed to make
the exposure. The smaller the aperture value, the shallower the depth of field and the
faster the shutter speed needed to make the exposure. Usually landscape photographs
use a large depth of field (large
aperture value) to keep the fore-
ground and background in focus,
and portraits use a shallow depth
of field (small aperture value) to
separate the subject from the
background.
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A SHORT GUIDE TO PHOTOGRAPHY
Photography can be a rewarding pursuit. It is a broad and disciplined field that can take
years to master. But the pleasure in making photographs and the joy of capturing a
magical moment cannot be compared. The guide is an introduction to some basic pho-
tographic principles.
Depth of field also changes with focal
length. The smaller the focal length,
the greater the depth of field; the
longer the focal length, the shallower
the depth of field.