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5m (about 16 ft
.
) and the aperture is f/8,
the
appropriate
graduations to left and right of
the
index
on the depth-of-field scale indicate ac-
ceptable sharpness from about 3.1 m to 12.4m
(approx
.
10 to 33 ft.).
Infrared index
For
proper
focus
when making
pictures with
infrared radiation, first focus your subject
with
visible
light
as described above, then attach a
red
filter
and turn the
focusing
ring to
the
right
to align
the
point of proper focus on the
distance scale with
the
index designated with
small red "R" in the
depth-of-field
scale.
When
making color pictures, follow the manufac-
turer's
recommendations
to
set
focus.
37
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