Minolta Auto Meter IV F - Page 27

For example,
if
you
are using
two filters, one
with
a
filter
factor
of
213 and the other
with
a
factor
of
1 213, the
filter factor
of
the
two together
is
2
113
(213
+ 1 213
:
1 413
or
2
113). To
add
this compensation
value
to the
meter's
operation,
press
and
hold the
ISO
button and
press
the down control
7 times
(6
times
for
the
2 whole-stops
plus
once
more for the additional
1/3-stop).
lf
you
are using
ISO 100 film, the
meter
should
now
read
ISO 20. Now,
each
time
you
take a
meter reading, the
Auto Meter lV F
will
automatically
compensate
for the
light
absorbed
by the
two filters.
48
49
****=***********
ILLUMINANCE
MEASUREMENTS
The
Auto
Meter
lV F
provides
you
with the
means
to
determine
the
illuminance,
in
lux
(lx),
of an
ambient
light
sou
rce.
1. Attach
the
flat diffuser
to the
Auto Meter
lV F.
2.Turn
the
meter on,
select ambient
mode,
Set
the film speed
to
ISO
100,
and
set
the digital
display
to EV.
3.
Position
the
meter so
that
it is
near
your
subject,
point
the
receptor
head
directly
at
the
light
source
you
are
measuring,
and
press
the
measurlng
button
to
take a
reading.
4.
Use
the
EV
indicated
by
the
meter and
refer to
the table
4 to
determine
the
illuminance.
Find the
integer
value of
the
meter
reading
in the
left-hand column
and
the decimal
value
in the
top
row.
Where
the
row
and
column
intersect
is the
approximate
illuminance
measurement
in lux.
For
example,
if the
meter displays
a
reading
of
EV 10.7,
the
row for
the
integer
10
and
the column
for the decimal
0.7
intersect at
4200
lx.
.llluminance
can
also
be calculated
using
the following
form u
la:
lx:2.5x2'u
For
precise
measurements
of
illuminance,
use
the
Minolta
llluminance
Meter.
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