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-EXPOSURE-continued---------------
Setting
the
Aperture
The second factor
in
determining exposure
is
the shooting aper-
ture. Aperture, or the opening formed by the diaphragm inside
the lens, controls the amount of light allowed to pass through
the lens and strike the film;
it
also controls depth of field (see
page
36
for more information).
In
low light,
you
are generally
required to use large apertures (indicated by f-numbers which
are low
in
numerical value, e.g. f/2.8), while
in
bright light, small
apertures are called for
(e
.g., f/16). The aperture ring @ features
click-stops at whole f
Is tops but
is
continuously variable through-
out its entire range. With the exception of a few special lenses,
Nikkor and Nikon Series E lenses enable full-aperture light
measurement regardless of the aperture setting. These lenses
have automatic diaphragms, meaning that the diaphragm stops
down
to
the preset aperture only at the instant of exposure.
To
keep you fully informed, the aperture
in
use appears
in
the ADR
window
CD
inside the camera's viewfinder.
30
Setting
the
Shutter
Speed
Shutter speed, or the length of time the shutter remains open,
also determines the amount of light allowed to strike the film.
The Nikon F3AF offers automatic stepless shutter speed control
over the range from
1/2000 sec. to 8 sec., plus full manual con-
trol with a choice of
18
settings, including B, T, and
X.
All shutter
speeds, except
T,
are electromagnetically controlled.