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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
ei
ther doubles or
hal
ves
the amount
of
li
ght transmitted. For exampl
e,
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
li
ght 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 1/1
000
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 we
ll
as Shutter-Priority Auto (5), Aperture-Priority Auto (A),
and Manual
(
/"I
) exposure modes.