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EXPOSURE MODE
Light reaching the film is
controlled
by
shutter speed
and lens
aperture.
The proper
combination
results in
a correct
exposure.
Shutter
speed and lens
aperture
settings
are based on the ISO
speed set
for the film in use
and
the
operation of
the
camera's
exposure control system.
The relationship between aperture and
shutter speed
is
as
follows: One
change
in
shutter speed
either
doubles
or
halves
Metering range
the amount
of
light transmitted. For example,
a shutter speed
of
1/
500 sec.
passes half the light of
1/250
and double the light
of
1/
1000
sec.
The
aperture fiB
passes half the light
of
f/
5.6
and
double the light of
fl11.
If the
correct exposure
for
a scene
is
1/
500
at
fiB,
then we
can also select 1/250 at fl11 or 111000
at
f/5.6
and achieve the
same
exposure results
,
and so on.
(for Matrix and Center-Weighted Metering with AF Nikkor 50mm
fl1.4
lens)
Metering range
depends on
the lens
in
use.
With
a
lens having
aperture
from
f12.8
to
fl
32, metering
range
at
ISO 100
will be
from EV1
to
EV23.
49
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