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I
L
LUM
INANCE
CA LCU
LATIONS
To
measure
the
illum
inance
of
an
ambient
light
(non-f
lash
)
source
:
1
.
Attach
the optional
flat
diffuser.
2.
Set switches
on
left
side
of
meter
to:
Analog-displayswitch..
..
."CONTRAST"
Digital-displayswitch.
.."ExlN"
Norm
al
lanalyze switch
.
.
.
"NO
R
M"
Single/mu
lti
switch
.
"S
I
N
G
LE
"
3,
Set measuring mode
to "AM Bl".
4-
Set function switch
to "lSO",
then set
the
film
speed
to
ISO
100.
5.
Set
function
switch
to
"TlME"
and
shutter
speed
to
1
sec.
or
any
of
the
C
lN E
settings.
6.
Position
the
meter
so
that the flat
diffuser
is
parallel
with
and
as
close as possible
to
the
subject
be
ing
i I
lu m
i
nated
, then
press
the
measu
ring
button to
ta
ke
a
read
i
ng.
7.
Use
the
"ExlN"
number in the
formula
below.
fux=2.5x2ExrN
Lux
100,000
10,000
1,000
14
16
lExlN.l
Example
With a display
reading
of
"Ex
lN
10.0"
work
the
equation
as
follows:
fux- 2.sxrExlN
-2.5x2lo'o
= 2.5
x
1024
=
approx. 2600
100
10
1
12
10
NOTE
o
F
or
precise
measu
rement
of
the
Minolta
llluminance
Meter
il
lum
inance,
use
is
recommended.
of
Exposure
Value
Numbers
To
determine
the
Exposure value
for
ambient light
measurement, set
the
meter
to "AMB|"
and
"TlME"
modes,
then
set
the
shutter
speed
to
either
1
sec.
or
any
"ClN
E"
setting.
Any
ISO
f
ilm-speed
setting
can
be
used.
The "Exl
N"
number
that
will
appear
after
taking a
measurement is
the
Exposure Value
("EV")
at
that
ISO setting.
4'.1
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