12 APERTURE
The smaller the aperture, the wider the range of sharpness. This is illustrated by
the picture above which was taken at f/22. Compare it with the photo to s right.
This extended depth of field is especially good for such subjects as landscap es .
The larger the aperture, the narrower the range of sharpness. An aperture of f/1.4,
for instance, can isolate your subject from its surroundings. This is often used to
blur a disturbing background in portraiture.
Depth of field is also greater the shorter the focal length of the lens. A 24mm lens,
for example, will show greater depth of field than a 50mm lens, provided the ap er-
ture and sho oting distance are the same. Depth of field is also greater the longer the
shooting distance, and is generally greater in the background than in the foreground
by a ratio of two to one.
24
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