VARIABLE
SHUTTER
THE
shutter
opening is controlled
by
the
SHUTTER LEVER, Figure 30.
EXPLA
NATION:
The
shutter, a disk
that
rotates between lens and film,
has an opening
allowing
light
to
pass
only
when
the
intermittent
claw
is
not
moving
the
film,
or
when
the
film is in
the
stationary
position. Like-
wise,
the
solid
portion
of
the
shutter
covers
the
film
while
it
is in motion.
Since
about
so
per cent
of
the
cycle is required for
pulling
down
the
film,
about
so
per cent
of
the
shutter
must be solid.
Figure
31
shows
the
ap-
pearance
of
the
shutter
it-
self
when
the
SHUTTER
LEVER is
at
CLOSED,
at
CLOSED
U
-OPEN
,
at
Yii-OPEN and
at
OPEN.
Fig.
30
The
size
of
the
shutter
opening
as
well
as
the
speed
of
rotation
determines
the
duration
of
ex-
posure.
'I
.·OP
EN
'I,·OPEN
OPEN
Fig.
31
USES:
For
the
sake
of
simplicity, most users
will
prefer to control exposure
with
the
diaphragm
and
the
camera speed, eliminating
the
variable
shutter
by always using
it
at
the
OPEN
position, except
when
making
fades
or
dissolves described under
Operation on
the
Cine-Kodak Tripod, page 41.
For
many
pictures
the
variable
shutter
will
be helpful;
these are listed on
the
following
page.
AS
AN
EXTRA
EXPOSURE
CONTROL:
There
may
be very unusual conditions where
the
light
is
so intense
that
even
the
smallest
diaphragm
open-
36
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