Sunpak auto24 - Page 16

Light
intenrity
computing
contor
+
Control
s€ction
+
Bypass tube
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Bypars
tubs over
licht out{ut
controlling
LIGHT
SENSOR
The
light
sensor
used in
the
Sunpak Auto
flash
unit stops the
flash tube
firing when
the
intensity
of light
emitted
from the
flash
unit
and
the
light
reflected
from
the
subject
being
photographed
match
the
conditions
for correct
exposure.
The light
sensor
measures
the
intensity
of light
reflected
from
the
subject
after the flash f ires
and automatically
controls
the
flash
light
in-
tensity.
The
light sensor
serves,
accordingly,
as
a
control
center f
or the intensity.
In addition
to
the
light
sensor, the flash
unit is
provided
with
a
control
section
which
signals
the
flash tube
to
stop firing
and
a current
bypass tube
con-
trolling
the
surplus.
Light
intensity
curve
of the
flash
unit
Light
Sensor
(Transmitting
signal to
the bypass tube)
Distance to
subiect.
-
14
-