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About
the
depth
of field
Ttle depth
of field
is tile
in focus
range,
measured
fl'om
tile distance
behind
a subject
to tile
distance
in fl_ont. Ttle
depth
of field
can
vary
with
the iris
(F value)
and
ttle focal
length.
Lowering
ttle F value
(large
iris) reduces
ttle depth
of field.
Raising
the F value
(small
iris)
provides
a larger
depth
of field.
Zooming
in telephoto
position
offers
a smaller
depth
of field
while
the depth
of field
in wide
angle
position
is greater.
The depth
of field
Shallow
Deep
Iris
Open (Low F value)
Close (High F value)
Zoom
Telephoto
(T)
Wide (W)
56
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