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Metering range of exposure meter
When there
is
a proper combination of lens aperture and shutter
speed,
0 lights
up,
indicating correct exposure. This sign will not
light
up
when the aperture and shutter speed combination
is
not
suitable for correct exposure. Also, if the combination of aper-
ture and shutter speed
is
improper for the brightness of the
subject, the exposure meter will not give
an
indication for cor-
rect exposure even if
you
vary the neighboring settings within
a very narrow range.
You
should try altogether different com-
binations of aperture and shutter speed. If
you
still fail to obtain
an
indication for correct exposure, then subject brightness
is
22
probably beyond the metering range of the exposure meter. It
is
necessary to illuminate the subject or to
use
an
NO
(neutral
density) filter
to
adjust brightness. Note that
in
full-aperture
measurement, the range of brightness that can
be
measured
by the meter varies with the maximum flnumber of the lens
in
use
,
as
follows:
With a 50mm
f/1
.4
len
s
(1
sec. at f/1.4 and 1/4000 sec. at fiB)
and
ASAIISO
100
film, the
EV
range is from
EV
1 to
EV
1B
.
With a 135mm f/2.
8len
s
(1
sec .. at f/2.B
and
1/4000 sec. at f/16)
and ASAIISO
100
film, the
EV
range
is
from
EV3
to
EV20