Nikon F3 Manuel d'instruction - Page 18
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-CONTROLS IN DETAIL-continued----------
The F3 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.
Being 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
18
to provide proper synchronization with electronic flash
units
other
than the Nikon SB-12.
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 11125 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
fill
,
twice as much light as flI6 and half at 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
fl16
or
1/250 at
fl8
will give the
same
exposure. 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
forth.