Creative
apertu
re
control
There may be times when it will be
most
i
mportant
to
set
the
lens
aperture
to
obta
in a
particular effect, such as rendering a
certa
in
range
in
sharp focus or emphasizing a
sub
j
ect
against an
out
-of-focus
background
.
In
this
case, set
the
desired
aperture,
and let
the
A:
Large lens opening
camera
select
the
shutter
speed. Small f-num-
bers yield a shallow field of sharp focus, as
in
Example A below, while large f-numbers give
greater
depth
of field, as
in
Example B.
To
determine
actual
depth
of field, use
the
depth
-
of-field scale (see p.
36).
B:
Small lens opening
27
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