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How
fo
select
fhe
f/stop
ond
shutler speed
Exposure
is
determined by the combination
of
shutter
speed
and aperture. As
the numbers on
either the
aperture scale
or
shutter speed/mode
selector dial
increase by one
increment,
the amount
of light
strik-
ing the
film
is reduced
by approximately
one
half. For
example,
the amount
of
light
at 1/250sec. is
one
half
that at
1/125sec.,
but the amount
of light at
'1l60sec.
is twice that at
1/125sec.
Likewise, the amount
of
light at
f/16
is one half that
at
f/11,
but the amount
of
light
at
f/B
is twice that at
f/11
. Brighter
scenes
require
either
faster
speeds or smaller apertures
or a com-
bination
of both which will
give
the
same
amount
of
exposure;
darker
scenes
require
the
reverse.
For
example,
if
you
obtain the correct
exposure
with
the combination of
1/125sec.
and f/11,
you
will also
obtain the correct exposure with
the combination of
1/60sec.
and
f/16,
and with
'11250sec.
and
f/8.
For
more information
about depth of
field,
see
page
45.
Shutter speed/aperture
combinations
that
give
the same exposure
EV
Ronge of
the
Cqmero
EV is
the abbreviation for
Exposure
Value. With
ASA/lSO 100
film and
an
f/2.8 lens,
the
exposure
value range
of the Nikonos-V is
between EV B and
EV 19
(t/30sec.
attl2.B to
1/10O0sec.
attl2D.
These
shutter
speed/aperture combinations
are not affected
by
ASA/lSO film
speed.
That is,
the Nikonos-V's
shutter speed/aperture
combinations are
always
1/3Osec.
ai 2.8 to 1/1OOOsec.
at tl22
at anv
film
speed f
rom
ASA/lSO
25 to 1600.
Shutter speed
(sec.)
1/10001/500
1t250 111251/60
Aperture
(f/number)
4
5.6
8
11
16
39
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