Sekonic Studio Deluxe L-28 C2 - Special Features of the Sekonic Studio Deluxe; Incident Light Measure; Lumisphere; Measuring Illumination

2,
Special Features
of
the
Sekonic
Studio Deluxe
2-1.
Incident Light
Measure
In
the
past,
conventional
exposure
meters
measured
illumination
by reflected
light.
The
Sekonic
Studio
Deluxe,
developed
and
perfected
by
the
world's leading
photographers,
determines illumination
by
a
more
accurate
method
:-incident light.
The
difficulty
with the
reflected light
method is
the
time
it
takes
a
photographer
to obtain
a
successful
exposure.
Every
subject
combines areas
of
high and low
reflec-
tion,
and
to obtain
a
proper
exposure
by reflected
light,
one
has to take
many
different readings
and to
average
them
successfully.
This
difficulty is
overcome
with
the
Sekonic
Studio
Deluxe.
lt is
designed to
measure
subjects
by
a stand-
ard reflection
of
L8/' and to
determine illumination
by
incident
light.
This
standard reflection
assures
perfect
tones in
black
and white
photography
and
establishes
a
point
of reference
from which
deviations
can
be made
for
special
effects.
2-2.
Lumisphere
The
Lumisphere
of the
Sekonic
Studio Deluxe
determines
exposure
in
a revolutionary
way.
Because
a suject is
usually
three-dimensional,
it
presents
a contrast
of
lights
and shadows
which
traditional
meters
are unable
to measure without
error or
difficulty.
The Lumisphere,
however, receives all incident
light
just
as the subject
receives
it. lt
automatically
assigns
to
each
light
source its
photographic
value
depending
on
its
strength
and direction,
and
averages them
into
one
correct
camera
setting.
2-3. Measuring
lltumination
(1)
The
Lumidisk
is
used
to
measure illumination.
lt
can
be
pointed
directly at
a
light
source to
measure
its intensity.
(2)
The top
numbers
on
the lncident
Scale indicate
foot
candles,
(i.e.,
the intensity
of light
on a
certain
spot.).
For example; if the indicating
needle
points
Io 64,
the light
intensity
or
illumination
on the
spot
is
64
foot-candles.
In oqder to
convert foot
candles
into Lux
units
of
illumination,
multiply the
number
of
foot candles
by
10.76. For
example, if
the ln-
cident
Scale reads 64
(which
is 64
foot
candles) the
corresponding
Lux
measurement
will
be
688.64.
64x10.76:688.64
When the
HIGH
Slide
is
used, the Incident Light
Scale
number must
be multiplied
by
32
to obtain
the Foot-Candle
Number.
For
example,
if
the Inci-
dent
Scale reads 64,
then
64
x32:2,O48
(foot'ca
ndles)
The
Studio Deluxe
ptays
an important
role
when
lighting
in
a studio
must
be recorded
for
future
duplication
and when
contrast
must
be controlled.
2-4.
Direct.Reading
Method
With the
Direct-Reading
Slides there
is
no
need to
fuss
with
the
Mobil
dial.
The
proper
f/stop
can
be
found
directly
from
the indicating
needle.
This
is
a
great
advantage
when
speed is
more important
than
obtain.
ing
a
complete
selection
of
f/stop
and
shutter
speed
combinations.
2,5. Intermediate
Values
(1)
The top
numbers on
the Indicating
Scale
are
foot
candle
numbers
from 4
to 1
M
(1000).
The red
numbers
directly
beneath
them
are
for
f/stops.
The values
of the
unnumbered
divisions
on
both scales
are
found in
the
diagram.
(2)
The
numbers on
the
Time
Scale indicate
shutter
speeds.
The
numbers on
the
Aperture
Scale indicate
f/stops.
Notice the
mark
beneath
each
number
on
the
Time
Scale and
above
each
nuntber
on the
Aperture