Nikon F3 Руководство по эксплуатации - Страница 33
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EVRANGEOFTHECAMERA------------------
-=-he
camera's meter
may be used
only
within the shutter
speed
range
covered
by the
exposure value (EV)
range
of
the
meter, which varies with
the aperture and ASA
/
SO settings.
The chart on page 35 shows
the
relationships between
the
Ustop,
shutler speed
and film
speed,
indicating the
slowest
functioning shutler
speed (for
metering purposes)
wit
h
any
film
speed/aperture
combination.
C
areful
attention
to
the following instructions will assure
precise exposure, automatically,
over the
complete
expo-
sure control and
meter range
capabilities of
your Nikon
F3
High-Eyepoint
camera.
• Auto exposure control at full aperture
For
example,
with
an
fl
l.4
lens
and ASAIISO 100 film,
the automatic shutter
will function down
to one
second
with the lens set
at
fll.4,
and proportionately
slower
as
the
aperture is
closed.
However, practically
speaking,
even
if the
shutler
speed/
aperture
combination
is
outside
the
guaranteed EV range shown in
Section
C
of
the
EV
C
hart,
you
can still obtain
good
exposures
at
either
the
AUTO
or MANUAL setting unless
"+
2000" or
"-8-"
appears
in the
viewfinder.
Using a standard of
ASAIISO
25
film,
you
may be as-
sured of at least a
four-second speed regardless
of the
aperture of the lens used
as
long
as the
lens is set
at
full
aperture (refer to
Table).
Using
ASAIISO 400
at fll.4
,
the slowest speed
is
114
second
;
however
,
as the
aperture
is closed down
,
the
fu
nctioning shutler speed becomes progressively slower
until
we
reach
fl8 when the slowest speed of eight seconds
is functioning.
• Auto exposure control with stop-down
metering
_
When
using a
bellows
or
other extension equipment
which
disengages the meter
coupling
device, it
is neces-
sary
to revert
to stop-down
metering
.
Certain limitations
are
imposed in this mode.
As lens-to-film distance is
increased
,
the metering range
(EV
range)
changes
proportionately.
For
example, when
an fl2 lens is used at 2: I reproduction (twice life-size)
the
effective flnumber
is
fl5 .6.
When
used at fl8,
the
effective
flnumber is
fl22.
When pictures are taken under minimal light levels, it is
desirable to use
a
high-speed film
(ASA
/
ISO 160
or
higher). Using
Tri-X
at
film
speed
400
with stop-down
metering,
with
an effective
flnumber of fl8, the
shutler
speed
range would be from
114
second to
112000.
Should
the
light
level
drop below
EV
6, it would be out of the
shutler
speed
range of the meter.
ASA/ISO
speed
6400
3200 (4000)
1600
800
400
200 (160)
100
( 80)
50
( 64)
25
12
Slowest shutter speed
{sec.}
1160
1130
1115
1/8
114
112
I
2
4
8
Table
Slowest shutter speed
at
full
aperture
with
any
lens
33