Advertisement
To permit instant reading of the depth of field
for any
lens
opening and distance, there is a
DEPTH-OF-FIELD SCALE.
This scale is composed of
the focusing scale and a scale of
numbers
cor-
responding to
lens
openings arranged on either
side of the focusing index.
Suppose
you have
set
the aperture to f/8 and the distance to
about 9 feet; this is how you read
off
the depth of field: To the
left of the focusing index
the
line marked with the figure 8 Ceor·
responding to the lens opening)
is opposite 6 feet. To the right
01 the index another line marked
with the figure 8 points to about
16 leet. This tells
you
that with
a
settin
g
of about 9 feet at f
/
8
you
have a depth-of-field zone
extending from about 6 to 16
feet. Within this zone everything
will
be sharp.
25
Advertisement
