Sekonic L-398 - Reflected Light Measurement; Luminance range adjustment; Stage 2: Key light setting; Stage 3: Adjust illumination contrast

Main
light measurement Fill
in light
measurement
Use white
or silver
reflector
to
brighten
shadow
portions
of sub-
lect.
lllumination
ratio
can
be varied
by
keeping
the
main
light f
ixed
and varying
the f ill
in
light.
3. Reflected
Light Measurement
Ref lected
light
measurement
is employed
for
the following
purposes.
a.
Luminance
range
adjustment.
b.
Self-lighted
subjects
such
as
neon
signs
which
can
only be
measured
by ref lected
light
method
and
locations
such
as show
windows
where
meter
cannot
be
brought into
proximity
with
subject
to allow incident
light
method.
Measurement
in
these
type situations
in
described
below.
1.
Luminance
range
center
point
Refers
to
measuring
subject luminance
by ref lected light
method.
This
luminance
varies
somewhat
according
to incident
light
strength
and surface
reflectivity
of the
subject.
lncident
light
becomes
measured
by taking
the
standard
surface reflection
as
18%, from
which
the
exposure
value
is
determined.
To
obtain
accurate
exposures,
the Lumisphere
is
used
to n.leasure
effective
footcandles
to determine
the Luminance
center
point.
Exposure
measurement
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