Incident
light
metering
Inincident
light metering,
light illuminating
the subject
(illumination)
is
measured
and
exposure is
calculated
with
the formula
[illumination
(light
striking the
subject)x
Accordingly,
incident
light
metering
will
indicate
the
same
exposure level
(f/16
in
group
A
photographs)for
all
subjects, i.e.
irrespective
of the
subject reflection
factor,
when
photographing
uMer
the same
light
conditions,
and
therefore
render
the neutral
gray
sheer as
gray,
the
high reflection
factor
white
sheet
as white,
and
the low reflection
factor
black
sheet as
black.
*Standard
reference
subjects
may have
a ref lection
factor
anywhere
between
120/o and26%
Minolta
bases its readinos
on a
reference
subject with
an
180/o
reflection
factor.
Spherical diffuser
Flat
diffuser
Minireceptor
Reflected light meteri ng
Reflected
light
metering measures
the light reflected
by
the
subject
luminance and
calculates
the exposure
so the specific
subject
luminance is rendered in neutral
tones. The formula
used
in
this calculation is:
fsubject
luminance
(illumination)x
subject reflection
factor
+
film
sensitivity
:
exposufe.]
Accordingly, reflected light
meters will indicate different
exposures
(f/5.62,
f/160, and
fl32stor
the black,
gray,
and
white
sheets,
respectively;
see
group
B) for subjects
with
different
reflection
factors when
photographed
under the same
light
conditions. The
result
is
that black,
gray
and white subjects will all be rendered in the
same
neutral
gray.
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Ref lected-l ight attachment
Viewfinder
5o
Booster II
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