38
DEPTH OF
F
I
E
LD
--------------------------------------------------------~
no depth
of
field
This
is
the range
that
appears in sharp
focus for any particular distance and dia-
phragm 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 reduces it.
The
depth
of
field also varies with the lens
used.
Wide
angle lenses hJve great depth
of
field while telephoto lenses provide lesser
depth
of
field
depth
of
field.
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 giving a soft, out-of-focus
effect
on
other ohjects in the scene.
This
will
de-emphasize distracting background objects
and concentrate the viewer's
at~ntion
on the
principal subject.
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