19
solves are attempted, they
should
be avoid-
ed when this type
of
film is used in the
camera.
Nizo automatic exposure time reduction
system
About
midway
between the
front
and rear
stops
on
the
variable
shutter
mechanism at
the
112
marking,
the
lever can be retained
by a
detent
if the lever
knob
is pulled
down
sli
ghtly
and released.
In
this
position
the exposure time
per
frame
is reduced by
half, from the normal
1/
43r
d
second
at 18 frames per
second
to
approxi-
mately
I/
S6th
second. In the same way, each
frame
at the 24 frames per
second
speed
is exposed for
only
1/115th
second
instead
of
I/S7th
second.
Do
not
use the automatic exposure time
reduction
system when
filming
at
54 frames
per
second, since the lens aperture
control
cannot
accommodate
t'1e
resulting
high
shutter
speed
.
At
the two slower filming speeds, the
expo-
sure
contro
l will automatically respond to
the
reduction
in exposure
time
of
one
half
by opening
the
lens iris by one
comp
lete
stop.
Automatic
exposure
correction
then
continues
normally. This provides you
with
the
following
additional
fi
·
lming
facilities:
1.
You can
continue
filming when
the
avail-
able
light
is so
bright
that the
exposure
meter needle in the
viewfinder
has already
reached the
warning
symbol (grey
filter
's
need
not
be fitted to the lens).
2.
A
delib-
erate reduction in depth of
focus
by halv-
ing
shutter
speed and
opening
the lens iris
by one shot
enables you to film
objects
against
an
indistinct, partly
out-of-focus
background. 3. Moving
objects
are more
sharply
outlined
at the increased
shutter
speed. However, it is then
particularly
im-
portant
to film fast moving
objects
at an
acute
angl
e,
or
else
their
movement
will
appear jerky.
After
filming
with the Nizo
automatically
reduced
exposure time system in use, do
not
forget to disengage the variable
shutter
lever
and
allow
it
to return to its
normal
position.
Increased exposure times
If you are filming single frames (time lapse
filming),
the
periods
of
time between the
exposure and
transport
of
the in
dividual
frames are,
of
course, much
larger
than at
the
normal 18 frames
per
second
filming
speed. You can make use of the increased
intervals by
increasing
the
exposure
time of
the
single
frame. This
combination
of auto-
matic time
lapse filming and increased
exposure time
enables a
satisfactory
film
to be made of
objects
in extremely
poor
light
conditions.
For
examp
l
e,
shots taken
inside museums, churches
or
other
poorly-
lit
buildings
can be
carried
out
success-
fully
without
recourse
to filming still
photo-
graphs, slides
or
other
material.
Depending on the single frame
filming
rate
chosen,
the
exposure
time will vary be-
tween l/sth
second
(at 6 frames per second)
and
1 minute (at 1 frame
per
minute). As
soon as you move the
variable
shutter
lever
past the safety catch into
the
shaded area
marked on the
camera
base (by pushing
down
the
lever knob), the
cutout
in the
shutter
disc
will
remain stationary in
front
of the film gate. The film will be exposed
until the
automatic
mechanism
controlled
by
filming
speed switch 2
transports
the
next frame
of
the
film into position in
front
of
the gate,
whereupon
the
shutter
will
rotate
once
to prevent
light
from striking
the
film
as
it is advanced. Move the vari-
able
shutter
lever back to the rear stop.
Press
the
safety catch in (marked with a
white dot).
This
will enable the lever to be
moved
further
into the shaded area on the
camera base.
Release the catch. The lever
is then locked into position.
Warning: With the variable shutter lever in
this position, the film frame in the gate
will
be
exposed
at
once. You shou
ld
there-
fore
only
engage the
increased
exposure
mechanism
after
the camera and the scene
to be
filmed
have been fully prepared.
As
for
all
filming
at extreme time-lapse
speeds, the Nizo
camera
should be
screw-
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