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EXPOSURE------------------------------
28
To
match the convenience of autofocus, the Nikon
F3AF features aperture-priority auto exposure. All
you
do
is
set the camera at A (Auto) and fire away.
Light
is
automatically measured through the lens
at
full aperture, and the correct shutter speed
is
electronically determined to match the aperture
in
use. The F3AF also lets you select the shutter
speed manually for complete creative control.
BecauSe the fast-reacting
SPD
metering cell
is
located
in
the camera body below the reflex mirror
@,
you have full metering capabilities even with
an
interchangeable viewfinder attached. Meter-
ing
is
centerweighted;
80
% of its sensitivity
is
concentrated
in
the
12mm~
center spot of the
focusing screen, while the remaining 20
%
is
distri-
buted over the rest of the screen.
To
get the cor-
rect exposure, center the main subject
in
the finder.
There are three factors involved
in
determining
exposure: film speed, aperture, and shutter speed.
All must
be
set correctly
to
get the proper exposure.