Nikon F3 Руководство по эксплуатации - Страница 34
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- EV RANGE OF THE CAMERA-continued-------
How to read the EV chart
• Full-aperture metering
Example: Lens
maximum aperture fll.4
ASA/ISO film
speed
100
Working
aperture fl5.6
By referring to the fll.4
column
in
Section
A and the EV
values indicated for ASAIISO 100 in Section D,
you will
find
that
the EV
range for
an
fll.4lens at
ASAIISO 100 is
I to 18. Now, refer to Section B and
single
out the
fl5.6
indication
for
ASAIISO 100
.
Go diagonally down
until
the protruding line intersects with
Section C's vertical
line
for the shutter speed
of
8 sec. (the
F3 High-Eyepoint
camera's slowest shutter speed).
From
this point of inter-
section,
follow the horizontal line that
leads to Section
D's
EV
value
for ASAIISO
100, and you will obtain
an EV
value
of 2.
Start again from
the
£/5.6
indication
for
ASA/ISO 100
in
Section B, and
go down
diagonally
until the protruding
line intersects
with Section C's vertical line for
the
shutter
speed
of
112000 sec. (the
F3 High-Eyepoint
camera's
fastest
shutter speed) this
time.
Then
follow the horizontal
line
that leads to
Section
D's
EV
value for ASA/ISO
100,
and
you
will get
a
reading
of
EV
16. This means
that an
£/stop of fl5.6
at ASAIISO 100 and
a
shutter
speed
of from
8 to
112000 sec
.
has an
effective
EV
range
of
2 to 16, which
is
well
within
the
F3 High-Eyepoint
camera's
metering
range of EV
I
to EV
18.
The
area encompassed
by the
heavy
lines in
Section C
demonstrates
a metering range
for full aperture method
using an fll.4
lens
and
ASAIISO
100
film.
34
• Stop-down metering
Example: ASAIISO film speed 100
Stopped
-down aperture
fl8
The procedure is the same
.
The
fl8 column
in
Section
A
and
the EV
values
indicated for
ASA/
ISO 100 in
Section
D
will show you
that
the
EV range for
fl8
is
6 to 23.
Refer
now
to
Section B
and
single out fl8 at ASA/ISO 100. Go
diagonally down
until
the
protruding
line intersects with
Section C's vertical line for the
shutter
speed
of 8
sec
.
From
this point of
intersection, follow the horizontal line
that leads
to
Section
D's EV
value
for ASAIISO 100,
and
you will obtain an EV reading
of
3. This means that an
flstop of fl8
at
ASA/
ISO 100 and a shutter
speed of 8
sec
.
give an EV
value outside
the metering range. To find out
the slowest shutter
speed
usable, follow the
fl8
indication
for ASAIISO 100 in
Section
B
diagonally
down until it
intersects the horizontal line
in
Section C that leads to
Section
D's EV
value of 6
for
ASA/
ISO
100,
and you
will
find that the
slowest
shutter speed usable is 1 sec. In
other
words,
at
fl8 and
ASAIISO 100, the available
shutter
speed range
that
is within
the
metering
range is
from
1 to
112000 sec., which
has
an effective
EV range
of 6
to 17
(indicated
by
the
broken line in Section C)-well within
the
metering range.
In
practice, you
will find that
it
is
generally the high end
and
the
low
end
which require a careful
check.
The
EV
range
of
the Nikon F3 High-Eyepoint
camera encompasses
most
lighting situations, and it is
only under
d im-light or
extra-bright
picture -taking
situations
that
you need pay
any special attention.