Nikon F3 Руководство по эксплуатации - Страница 33
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EVRANGEOFTHECAMERA--------------------
How to read the EV chart
• Full-aperture metering
Example: Lens maximum aperture
fll.4
ASA film speed 100
Working
aperture fl5.6
By referring to the
fll.4 column in
Section A
and
the EV
values
indicated for ASA 100 in
Section
D,
you will
find
that
the EV range for
an fll.4
lens
at
ASA
100
is I to 18.
Now, refer to
Section
B and
single out
the
fl5.6 indication
for ASA
100.
Go
diagonally down
until
the
protruding
line
intersects
with Section
C's
vertical line for the
shutter
speed of 8 sec. (the
F3's slowest
shutter speed).
From this
point of
intersection, follow the horizontal line that leads
to Section
D's EV
value
for ASA 100,
and you
will
obtain
an
EV value
of
2.
Start again
from
the fl5.6
indication for
ASA 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's fastest
shutter
speed)
this time. Then follow
the horizontal line
that leads
to Section
D's EV
value
for ASA
100, and you
will
get a
reading of
EV 16. This means
that an flstop of fl5.6 at
ASA
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'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
ASA 100
film.
• Stop-down metering
Example: ASA 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 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 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 ASA 100, and you will obtain an
EV reading of
3.
This means that an flstop of fl8 at ASA
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 ASA 100 in Section B
33
diagonally down until it intersects the horizontal line in
Section C that leads to Section D's EV value of 6 for ASA
100, and you will find that the slowest shutter speed
usable is I sec. In other words, at fl8 and ASA 100, the
available shutter speed range that is within the metering
range is from I 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 encompasses most lighting situ-
ations, and it is only under dim-light or extra-bright
picture-taking situations that you need pay any special
attention.