Pentax AF500FTZ - Effect of Aperture

Closed-down
aperture
Effect
of
Aperture
The
aperture increases
or
reduces
the amount
of
reflected
light
from
an
object through the lens,
controlling
how much light
strikes
the
film. lf
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.
lf
the
aperture
is
closed
down to
reduce
the
amount of
light,
the depth of
field
increases.
For
example, 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
appear to rise
out of the
landscape.
By
contrast,
closing
down the
aperture
increases
the
in-focus
range.
o
The
smallest f-number refers
to the
largest
lens
open-
ing;
the
largest
f-number refers
to the smallest lens
open
i
ng.
q
(I
q
D
tr,
z,
ct:
m:
trrt
6F
!
m
-
=
(t
z
U'
Open
Apertu re
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