Nikon F3 Руководство по эксплуатации - Страница 34
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-EV RANGE OF THE CAMERA-continued-------
The
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
settings.
The
chart
on page 35 shows
the
relationships between the
flstop, shutter
speed and film speed, indicating the
slowest functioning shutter speed (for metering purposes)
with any
film
speed/aperture
combination
.
Careful
attention to the
following instructions will
assure
precise
exposure, automatically, over
the complete
expo-
sure control and meter
range
capability of your
Nikon F3.
• Auto exposure control at full aperture
For
example,
with
an fll.4
lens
and
ASA 100 film, the
34
automatic shutter
will function
down to one second with
the
lens set at fll.4, and proportionately slower as
the
aperture
is
closed.
Using
a standard of
ASA
25
film,
you
may be assured
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 ASA 400
at fll.4,
the
slowest
speed is
114 second;
however,
as the aperture is closed down,
the
functioning
shutter
speed
becomes progressively slower
until
we
reach
fiB
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 fl21ens is
used
at 2:
I
reproduction (twice life-size) the
effective flnumber is fl5.6. When used at
fiB,
the
effective
flnumbe
r
is
fl22.
When pictures are taken
under
minimal light levels, it is
desirable to use a high-speed film (ASA 160 or higher).
Using Tri-X at film speed 400 with stop-down metering,
with an effective flnuonber of
fiB,
the shutter speed range
would be from 114 second to 112000. Should the light
level drop below
EV
6,
it
would be out of the shutter
speed range of the meter.
Table
Slowest shutter speed
at
full
aperture with
any lens
ASAspeed
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
1
2
4
8