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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
co
mbination
.
Careful
attention
to
the
following instructions will
assure
precise
exposure,
automatically,
over
the
co
mplete
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;
how
ever,
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
(E
V
range)
changes
proportionately. For
example,
when
an
fl21ens is used at 2: I
rep
r
oduction
(twice life-size)
the
effective
flnumber
is fl5.6.
When
used
at
fiB,
the
effective
flnumber is
fl22.
When
pictures
are
taken
unde
r minimal light levels, it is
desirable
to use a h
igh
-
speed
film (ASA
160
or
higher).
Using Tri-X at film
speed
400 with stop-down
metering,
with
an
effective flnuonb
er
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