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.
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