Sekonic L-398 - Stage 4: Adjust luminance range; Stage 5: Determine correct exposure

Luminance
range
center
point
The Studio Deluxe
indicates
normal color
photograph
lumi-
nance range limits
corresponding
to 2'f stops
left
and
right of the
luminance
range
center
point.
Exposure value
i
ndication
Luminance
range
upper limit
2
!
stoPs
4. lllumination Adlustment
The
Studio
Deluxe
possesses
an array of
functions
for the
per-
formance
of illumination adjustments
which were
nearly unknown
in earlier instruments.
lt
allows the shooting
site to be
set
up
quickly
and
accurately.
Described
here
are
set up
procedure
and
29
examples to
provide
full
control over movie
scenes.
lt
would not
be
erroneous
to also apply these
to still
photos.
Stage
1
Determine
overal
I lighting
strength.
a. Set meter to ASA 100
(see
f ilm
sensitivity
intermediate values).
b. Set
24 red line
of cine speed
scale to
f/5.6.
c. At this time, L
^
mark
indication
on dial
scale becomes slightly
lower
than
640
(footcandles).
lf this is
taken as the
meterscale
position,
a value of 500
footcandles
(lower
than 640
footcandles)
becomes the
required
lighting
strength
(see
meter intermediate
scale values).
Stage 2
Key light
setting
a.
Turn on key
light
(main
light)
and determine direction
required
for
subject
illumination.
b.
Without
installing
slide,
hold meter
at the subject
position, point
Lumisphere toward
camera and set stopper button to
released
C
position.
c. Adjust
main
light intensity
or distance until
meter indicates
400.
The indication
can then be
increased
to the
required
500
foot-
candles
(determined
in
Stage 1c)
by applying
fill in
light.
Stage
3
Adjust
illumination
contrast
a.
Install
Lumidisc in
place
of Lumisphere.
b.
Measure key
light
(indication
should
be
400
footcandles).
c. Turn on fill in
light.
d.
As
described
in
section on outdoors lllumination
Contrast
Adjustment,
adjust
fill
in light
to obtain suitable
illumination
contrast.
(For
a contrast
ratio
of 2:1,the
fill
in
light
indication
must
be 200
footcandles.)
Lighting from
back affects
contrast
only slightly.
30
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