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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
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 f/8
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 f/8
,
then
we can also select
1/
250 at
f/
11
or
1/
1000
at fl5.6 and achieve
the
same exposure
results,
and so on.
46
SELECTING EXPOSURE MODE
Selecting the
exposure control mode
means
deciding
if
you
want
the
shutter speed
andl
or
lens aperture to be
set
automatically or
manually.
The Nikon N70 camera offers two types of programmed auto
exposure
modes, Auto-Multi
Program (P) and Vari- Program
(Ps) ,
as
well
as
Shutter-Priority Auto
(5),
Aperture-Priority Auto
(A),
and
Manual
(/"I) exposure
modes.
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