--
DEPTH OF
FIELD
-----------------------------.;
32
no depth
of
field
This
is
the range
that
is in sharp focus for
any particular distance and diaphragm setting.
There is relatively very little
depth
of
field
where close-up subjects are focused
on
, and a
great deal
of
depth
of
field in the case
of
more
distant subjects. Closing
the
diaphragm down
increases the
depth
of
field, and opening the
diaphragm up reduces
the
depth
of
field. The
depth
of
field also varies with the lens used. Wide
angle lenses have lots
of
depth
of
field while
with telephoto lenses
the
depth
of
field
is
much
depth
of
field
reduced.
If
your
picture
is
such
that
you want
both
nearby and distant objects
to
be in sharp
focus, then the smallest possible diaphragm
should be used. However, very frequently
the
composition
of
a picture can
be
improved by
having
the
principal subject in sharp focus while
other
objects in
the
scene are soft and
out
of
focus. This will de-emphasize distracting back-
ground objects, and concentrate the viewer's
attention
on
the
principal
su
bject.
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