Nikon F3 Manual de instruções - Página 18
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-CONTROLS IN DETAIL-continued----------
The
F3 High-Eyepoint camera
has
two separate
settings
for
time
exposures. On "B," the
shutter remains open for
as
long
as the shutter release button is
depressed.
On "T,"
the shutter
stays open until the dial
is
rotated to another
setting,
making
it ideal for really
long time exposures.
Be-
ing
a mechanical setting,
"T"
will not
cause
battery
drain
regardless
of
how
long
the shutter remains open.
*
"X"
provides a
shutter
speed
setting of 1/80 sec. It
is
used
to provide
proper
synchronization
with
electronic
flash
units
other
than the Nikon
dedicated
flash
units
.
The
amount of
light reaching
the film
plane is determined
by a combination of the
shutter
speed and
the lens
aperture. Since the
two
are interrelated, different
combi-
nations
will give the same degree
of exposure
.
A
one-step
change in shutter speed, or
a one-stop change
in aper-
ture
setting,
will
either halve
or
double the degree
of ex-
posure.
For
example, a
shutter
speed
of
1/125 sec.
lets
in
twice as
much light
as
a setting of
1/250
sec
.,
and
only
half as much light at
1/60
sec.
For
an aperture setting
of
fi
ll
,
twice
as much
light as
fl
I6
and half as much as
fl8,
is
let
in
. Thus
, if
the
correct
exposure
for
a
particular
picture-taking situation
is
1/125 at fill, then 1/60 at
fll6
or
11250
at fl8 will give
the
same exposure.
18
The
following table illustrates
the
interrelation between
shutter
speed
and aperture.
- - - - - , - - - - - , - - - - - , - - - - - , - - - - - ,
The best
combination
will depend on the results
you
want.
Use
fast shutter speeds to freeze motion; use slow
speeds to
produce a deliberate blur.
(See
the
example
pictures on
the
opposite
page
.).
Also,
small
apertures
give
greater depth
of field,
while large apertures restrict
sharp
focus
to
the main
subject.
(See page 26.)
A
good rule
to
follow in preventing camera shake is
to
select
a minimum
shutter
speed which is the reciprocal
of
the
focal
length
of
the lens in
use.
For
example, when
using a normal 50mm lens, select a
speed
no
slower
than
1/60 sec
.
(the closest number to 1/50).
For
a 500mm
super-telephoto,
use no less than 1/500
sec .,
and so
for
th.
•
To
make a
mechanical release,
turn
the
power switch off and make sure
the LCD inside
the finder
is
not displayed. Then, trip the
shuller
using
the
backup mechanical
release lever.