Nikon Nikkormat FS 매뉴얼 - 페이지 18
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페이지 인쇄
DEPTH OF FIELD
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When a subject point is brought into
focus by a lens at a specific distance
from that point
,
the actual point on
which the focus is made is considered
to be the most sharply defined in the
picture
,
and the sharpness of other
points which
lie
in front of and behind
this paint
of
focu
s
gradually dimini sh.
Within
certain limits
,
howevet
,
these
may appear reasonably and acceptably
sharp
.
The range within which points
in
front
of and behind the point of
focus
,
appear acceptably sharp
,
is called
the depth of field
.
Depth of
field increases as the aperture
of
the
lens
is made smaller. Shortenin
g
the lens focal length or
increasing
the
distance
between lens and
subject
also
increases depth
of field.
These three
factors can operate
independently
or
in conjunction
.
One factor may act to
partially cancel the effect
by
the
other.