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Pentax ZX-5 - Page 90

Pentax ZX-5
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ADVANCED
OPERATIONS
Open
aperture
Effect
of
Aperture
The
aperture
increases
or
reduces
the
amount
of
re¬
flected
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,
objects
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
closed
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
be¬
hind
the
person
will
be
blurred,
making
the
person
ap¬
pear
to
rise
out
of
the
landscape.
By
contrast,
closing
down
the
aperture
increases
the
in-focus
range.

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