Sekonic L-398 - Page 12

Distant scenes
are
subject
to
haze
due
to atmospheric
effects on
light
and can
be
easily overexposed.
For
this
reason,
first
use the
Lumisphere
and
measure by standard
method
from the
camera
position.
Then
point
the
Lumisphere
toward
the sun and
measure.
Determine
exposure
f
rom the mean
of
the two
obtained
values.
Note: To obtain
the
mean of the
two
values,
perform
as
follows.
.
Transfer
mean
value of the
two
footcandle
indications
(aperture
scale)
to
the dial.
Example:
lf
320(8)
footcandles
and 80(4)
footcandles
are
obtained,
the
mean
value becomes
160(5.6).
In
the
case
of
80(4)
and
40(2.8)
footcandles,
the
intermediate
becomes
the
desired
value. Consequently,
transfer
that
value to the
dia
l.
o
Transfer
each
footcandle value to the
dial to
obtain
exposure.
In
cases
of
the
same
aperture,
setting
the
shutter
speed to
the
average
is
acceptable.
19
4.
Snow Scenes
a.
Many cases of
problems
occur with
reflected
light measuring
methods due to snow surface
glare.
Using incident light
measure-
ment eliminates these
concerns.
Freshly
fallen
snow
possesses
a
ref lectivity
of
approximately
73o/o, while
even
after several
days
in urban
areas,
this
declines
only
to
about 6o0/o. Compensation
must therefore be
performed.
Measurement by
standard method
is reduced
by
l
ltE
-
112.
Example:
lf
T
becomes
11125
at
f
16:
11125
x
11,,,8
=
11177
=.
1t2OO or 11125 x
112
=
11250
take
on a
flour-like
appearance without
luster
in
finished
photograph.
Note:2:
l
ltP
N
112 compensation
amount
is
based on the
re-
f
lectivity
value
of snow.
This
may
vary
according to snow
quality
and soiling.
20
can
the
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