Notes
Depth
of
field is also greater the shorter the focal
length
of
the lens. For example, a
24
mm
lens will
show
greater depth
of
field than a
50
mm
lens, pro-
vided the aperture and shooting distance
are
the
same. Depth
of
field
is
also greater the longer the
shoot
i
ng
distance, and is generally greater
in
the
background than
in
the foreground by a ratio
of
two
to
one.
With
a Canon
FD
lens, viewing and metering
are
done at maximum aperture where the viewfinder
is
brightest. The lens diaphragm does not close
to
the
shooting aperture until the shutter
is
released.
Afterwards,
it
reopens automatically
to
the max-
imum aperture. Because the maximum aperture
pro-
vides the narrowest range
of
sharpness, the subject
is viewed
with
the shallowest depth
of
field.
50
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