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27
Creative aperture control
There may be
times
when
it
will be
most
important to
set
the
lens
aperture
to obtain a
particular
effect, such
as rendering a
certain
range
in
sharp focus
or
emphasizing a
subject
against
an out-of-focus background
.
In this
case,
set the desired
aperture, and
let the
A: Large lens opening
camera
~elect
the
shutter
speed
.
Small
f
-
numbers 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
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