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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
1/43rd
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
automatica
lly
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
avai l-
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
iri
s
by
one shot enables
you
to
film
objects
against an
indistinct,
part
ly
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 ang le, 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
sing le 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 le, shots
taken
inside museums,
churches
or
other
poorly-
lit
buildings
can be carried
out
success-
fully
with
out
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
should
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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