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
power 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 available 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
produced 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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