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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.
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