User manual
Table Of Contents
Lens
opening
Relative
exposure
time
i
~
1
.
8
1-
2.0
1.2
2.8 1
2:.
4
.
0
1_
~~
1
11
2.4
3.8
/
4.9
9.7
I
20
37
16
79
Through
the
table
one
can
readily
see
that
large
lens
openings
are
indi-
cated
by
lower
figures,
and
vice
versa.
When
the
Scale
is
moved
to
the
next
highe,
figure
the
time
of
exposure
should
be
doubled -
in
other
words,
the
shutter
speed
should
be
reduced
to
one hall.
And
when
moved
to
the
next
lowe,
figure
the
shutter
speed
should
be
doubled.
If,
for
instance,
an
exposure
meter
indicates
a
shutter
speed
of
1/
200
sec.
for
a
f-opening
of
5.6,
the
shutter
speed
must
be
reduced
to
1/
100
sec
.
with
f-opening
stopped
down
to
8,
or
if
the
shutter
speed
increcsed
to
1/
400
sec.
the
f-opening
is
set
to
4,
in
order
to
maintain
the
correct
exposure
of
the
film.
21