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17
vals of
two
seconds.
Special
features:
the
Braun F 800 can be
operated by
the
so-
called
duplex
system
from
the mains
when
making animated or
time lapsed
films;
this
greatly increases
its
capacity.
In
addition
,
its
storage battery cari be used as an
out-
side
pow er
source
together
with the camera
supply
lead
,
if
the Nizo
ZSSA cable
is
in-
corporated
into the
setup.
The
single-unit Braun
2000
VarioComputer
flash
gun
is
currently avail able in three
mo-
dels:
F
022,
F
027
and
40 VCR.
The
only
difference
between
these
is
in the
guide
numbers of 31
,
38 and 40 respectively
for
21
DIN film.
The power consumed
by these
flash units
depends on
the filming distance
and also
by
the amount of
light
absorbed
by the
objects being filmed
.
At
a
filming
distance
of
1 meter
and
with
a background
which does not
absorb
too much light,
flash
intervals
of
approx.
1
second can
be re-
peated
about
1000 times
(type F
027).
Practical
hints for Nizo filming
using
elec-
tronic
flash
:
The light
produ
ce
d
by
the
electronic flash gun
has
th
e
same color
temperature
as
daylight.
The filter switch
on your
Nizo
camera should therefore
point
to
the
sun symbol.
The
flash
intervals
must
be shorter
than
the
time
lapse interval
selected at filming
speed switch
2.
.
The
lens
iris on
your
camera
must be
opened by one stop
more than
the
expo-
sure calculator
on the flash unit
states,
since the
light
splitting prism in the
Nizo
camera and
the
exceptionally
large number
of elements
in
the zoom
lens must be taken
into
account
(see «manual
control
of lens
aperture»).
The variable shutter
General description of variable shutter
mechanism
The variable
shutter
is the
<
<light trap
»
of
your
film
camera.
It is
a
disc rotating
in
front of the
film
gate.
While the disc
is cov-
ering the gate, the film
is
advanced
by
one
frame. When
the cutout
in
the
disc is
oppo-
site
the
gate,
light
can strike
the
surface
of
the
film. On the Nizo cameras the
cutout on
the
shutter
disc
can
be
con·tinuously
varied
in size while the shutter
is
operating, so
that fade-in
and
fade-out
effects can be
produced
.
In
addition,
deliberate
reduction
of. the
shutter area
(size
of cutout)
reduces
the
exposure
time if this proves necessary,
or
alternatively
the
exposure
time can be
prolonged
by stopping
the
shutter
in
the
open position
in
front of the film
gate.
Fade-in and
fade-out effects
To fade
out a scene,
hold the
camera
han-
dle in the
right
hand. With
the
other hand,
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