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DEPTH OF FIELD
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When a lens is focused on a given
subject, there is a certain range
behind and in front of the subject
which appears
sharp.
This range is
called "depth of field
"
, and it varies
according to the aperture set
:
large
apertures
(e.g.
,
f/l.7)
yield
a
shallow depth of field rendering the
background out of focus (example
A)
;
small apertures (e.g .,
f/22)
give
greater depth of field with sharper
background (example 8). The depth
of field can be checked on the lens'
depth-of-field scale as shown
.
Depth of field also varies with
subject distance: when the lens is
focused on a close su
bject,
the
depth of field is shallow; when
focused on a distant su bject, the
depth of field is
greater.
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