User manual
Table Of Contents
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46
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Generally,
the
depth
-
of
-field will
become
deeper
as
the
aperture
becomes smaller,
and
shallower
as
the
aperture
becomes larger. A
shorter
focal length as well
as
a greater
camera-to-subject distance will also
deepen
the
depth-of-field.
Comparing a 2Bmm lens with a
standard
50mm
lens
set
at
the
same
flstop,
the
2Bmm
lens's depth-of-field will be greater. And when
the
photographic
distance changes,
the
depth-
of
-field changes,
too.
For
example,
if
the
same
subject
is
photographed
from
three
and
then
from seven
meters
away,
the
sharp foreground
and background
of
the
subject will
be
deeper
at
the
greater distance.
Depth-of-Field Scale
on
the
Lens
A depth-of-field scale
is
engraved on
the
lens barrel, shown
as
a series
of
flnumbers
on
each side
of
the
distance index mark opposite
the
distance scale. Focusing and
depth
-of-field
are
so
closely interrelated
that
the
depth
-
of
-
field scale
is
engraved
together
with
the
distance scale.
You can tell
the
extent
of
depth
-
of
-field
from
the
distance scale. For example, if you
use
the
camera with a
standard
50mm
lens
that
is
focused on a subject at medium
distance, say
3m
with
the
aperture
set
at
fiB,
the
depth-of-field
extends
from
2.4m
to
4.5m
.
This tells you
that
with
the
50mm
lens
focused
at
3m
and
the
subject between 2.4m
and
4.5m
the
film image will be reasonably
sharp.