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DEPTH OF
FIELD
With 50mm
f/1.4 lens
?zt
* Camera-to-subiect
distance (m)
15ro9a76
Depth of field refers to the ran$e
around
the optimum
focusing
point of the subject
in which the elements
at
different
distances
are
in focus.
:_-- Camera-to-su bject distance
11\
d
- Depth of f
ield
M
,5
w
The depth of field increases as the aperture
becomes
smaller,
as the focal length of the lens
becomes
shorter,
and
as
the
subject
is
positioned
farther away. By changing
apertures,
you can control the depth of field and
create
different visual eff ects.
As ilf ustrated
in the examples at right (using
f 11.4
and
tl22 settings), the in-focus range
can be conf
irmed by
the depth-of-field
scale
on the lens.
* Some zoom lenses
do not have a depth-of-f ield scale
due to mechanical reasons.
.*fl ril;,:r;.,.*;,ikistkxirdi$8&
www.butkus.us
59


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