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one property of /enses is that when they are focused on
a
certain object, not onty the subiect itserT, but att oolecis
in a
certain range in front and back of the subject witt ippiar
a.cceptably sharp in the picture. This range is catteti ine
depth-of-tietd. The depth-of-f ietd of a givin lens ,arLs,
as
follows.
I
lf the aperture is stopped down, the depth-of{ierd increases;
if the.aperture is opened up the depth-of{ield decreases.
a,
As the distance to the subject increases the depth-of{iero
Increases; as the distance to the subject decreases ihe
depth-ot-
field decreases
o
The depth-of{ierd is greater behind the subject on which the
lens is focused than in front of it.
Different lenses may have different depth-of{ield limits. A lens
of
short focal tength has greater depth-ot-rietd at any set distance
than a lens of long focal length.
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