TTL EXPOSURE METER-Continued • How
to
read
the
EV range
chart
The
chart
indicates
the
EV
(for ASA 100)
vs.
shutter
speed range.
To
determine
the
shutter
speed range,
note
that
the
bars
in
section A indicate
the
responsive range
of
the
ELW's photosensitive CdS
element
(i
.e.,
f/8
covers EV6-22, f/16 covers EV8-22)
for
the
f-stop
in
use.
I n
Section
8,
note
the
f-
stop
being used
on
the
appropriate
ASA scale.
For
example,
at
ASA
25
with
the
lens set
at
f/8, we follow
the
line
diagonally
and
find
that
it intersects EV6
at
four
seconds,
and
at
EV18 runs
off
the
scale
at
1/1000
second.
ASA
100
at
f/8
runs
from
EV4
at
four
seconds
to
EV
16
at
1/1000
second.
In
any
case,
it
is
generally the low end which
requires a careful check. The wide exposure (EV)
range
of
the Nikomat
EL
W will encompass
most
lighting situations. It
is
only under dim-light or
rare
bright-light situations that any special atten-
tion need be paid.
38
Full-aperture metering
The
metering range
is
determined
by
the
bars
(Section A), fl
number
range
in
appropriate
ASA
scale (Section 8) and
shutter
speed
(4
-1/1000
sec., Section
C).
For example,
the
green area
encompassed by
the
heavy lines
demonstrate
a
.
combination
of
an
filA
lens and ASA
100
film.
Stop-down
metering
The
metering range
is
determined
by
the
bars
(Section A),
flnumber
in
appropriate
ASA scale
(Section 8) which
corresponds
to
the
stopped-
down
aperture
in
operation,
and
shutter
speed
(4
- 1/1000 sec., Section
C).
The
green line
demonstrates
stop-down
measurement
in
the
case
of
an f/8 lens
combined
with ASA
100
film,
indicating a range
from
1 sec.
to
1/1000
sec.