User manual
Table Of Contents
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Distance Scale
The distance scale
is
for distances
measured
from
the
film plane. This scale
is
not
generally used
except
for
confirming
the
depth
·
of
·field, performing guide
number
calculations
in
flash
photography,
or
photo·
graphing
with
infrared film .
Read
one
-digit distances
in
the
middle
of
the
number
marked
on
the
scale.
Two
-digit
distances
should
be read
at
the
point
in
the
middle
of
the
two
digits.
Depth-of-Field Scale
You
can
determine
the
depth-of-field by
checking
the
depth-of-field scale and
the
distance scale
on
the
lens barrel. Both are
closely interrelated.
Infrared Index
Mark
The
red
dot
infrared index
mark
engraved
on
the
lens barrel
is
a focusing
correction
index
mark
for infrared film. Because infrared
light rays have longer wavelengths,
they
focus
on
a plane slightly
behind
that
of
ordinary
visible light rays.
Therefore,
it
is
necessary
to
slightlly
modify
the
normal
method
of
focus-
ing
the
lens.
After
focusing
the
same
as usual,
note
the
tiny
red
dot
engraved
on
the
lens
barrel just
to
the
right
of
the
distance
index
and
turn
the
focusing ring slightly
to
align
the
focused
distance
with
this red
dot
.
For
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