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63
Effect of aperture
The aperture increases or
reduces the amount of reflected
light from an object which
passes through the lens,
controlling how much light
strikes the film. If the aperture is
opened up to increase the
amount of light, subjects in front
of and behind an in-focus
subject will not be focused. That
is the range of focus (depth of
field) becomes small. If the
aperture is stopped down to
reduce the amount of light, the
depth of field increases. For
instance, if you shoot a person
against a landscape with the
aperture open, the landscape in
front of and behind the person
will be blurred, making the
person appears to rise out of the
landscape. By contrast, stopping
down the aperture increases the
in-focus range.
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