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DEPTH OF FI ELD - continued
Depth-of-Field Scale
Depth of field can be read from the color-coded scale
engraved
on the milled ring. The pairs of
colored
lines
correspond to flnumbers of the same color. To find
the depth of field at a particular aperture first focus
the lens on the subject (or set the lens-to-subject dis-
tance on the distance scale). Then check the numbers
on the distance scale opposite the colored lines which
match the taking aperture of the corresponding color
to find the depth of field at that aperture.
For example,
f/16
on the aperture ring of the 50mm
f/l.4
lens is blue. With the lens prefocused at 15 feet
(4.5m), the numbers on the distance scale opposite
the blue lines show that depth of field extends from
8 feet (2.4m) to infinity
(00).
22
By
stopping
down the
lens only, the depth of
field
can
be increased, as
illustrated
by the
following three
photographs:
1.
Lens at f/4. Small
depth of field
with
only
main
subject in focus.
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