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much light
as
1/60 sec.
Note:
When
you set the shutter speed/mode selector dial to
either
M90 or
B,
the exposure
meter
does not work and the
viewfinder
LEOs don't light.
M90
(1/90
sec.)
At
this setting, the shutter operates mechanically at
1/90 sec., and
is
used mainly when the battery
is
drained and other shutter speed modes are not
operable, and for flash photography with
an
elec-
tronic flash.
B
(Bulb)
At
this mechanical setting, the shutter curtains
'$J
remain open
as
long
as
you press the shutter release
button. B
is
used
for
long
time exposures.
Note:
When
the shutter speed/mode selector dial
is
set
somewhere between
1 sec. and M90 and the shutter release
button
(f!,
is
accidentally depressed, the shutter curtains re-
main open.
If
the film
is
rewound
in
this situation, every frame
will be re-exposed, damaging the pictures taken. Therefore,
before rewinding make sure that the selector dial is not
in
this
intermediate position.
The
Nikon FG employs TTL (through-the-Iens) center-
weighted full-aperture exposure measurement which
measures the amount of light passing through the
lens with the aperture fully open, thus always
assur-
ing
a bright finder image during shooting. Exposure
measurement emphasis
is
placed especially
on
the
brightness
in
the
12
mm
dia. central area (refer to
page
15),
although the meter reads the light over the
entire focusing screen. Thus, correct exposure
is
assured when shooting with the main subject situated
in
this central area.
On
both P and A modes, the
FG
employs instan-
taneous stopped-down exposure measurement. This
measurement system sets the optimum combination
of shutter speed and aperture at the actual
split-
second moment of picture taking, assuring accurate
exposures even
if
the light changes at the very last
instant. A sensitive
SPD
(silicon photodiode)
is
used
to measure light intensity.
21