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for ASAIISO
100
in
Section B, and go down diagonally until the
protruding line intersects with Section
C'
s vertical line for a
shutter speed of
1/
2000 sec. (the F3AF's fastest shutter speed)
this time. Then follow the horizontal line that leads to Section
D's
EV
value for ASA/ISO lOa, and
you
will get a reading of
EV
16
. This means that at
an
fl
stop of
1/5
.6 at ASAIISO
100
and at
shutter speeds from 8
to
1/2000 sec
.,
the effective metering
ran
ge is
EV
2 to
16
, which
is
well within
the
F3AF
's
metering
range of
EV
1 to
EV
18
.
The
green area
in
Chart 1 encompassed by
the
heavy lines
in
Section C demonstrates the usable shutter speed range to
match any film speedlaperture combination at ASAIISO
100
.
(The minimum aperture of the lens is
1/16.)
Similarly
in
Chart
2,
the usable range (at ASAIISO
100)
for the
AF
-Nikkor 80mm f/2.8lens
is
shown
in
green.
Two
red lines
in
Section C of both charts indicate the EV value
ranges of the scene brightness usable with autofocus or focu
s-
aid operation. Therefore, the combinations of shutter speeds
and
apertures indicated
in
the areas outside the lines are not
usable.
Stop-down metering
For stop-down metering, Section A indicates the usable
EV
range for various aperture settings. For example, if the
len
s
is
stopped down to f/8 at ASAIISO lOa, refer to the f/8 column
in
Section A and the
EV
values indicated for ASAIISO
100
in
section D, and
you
will find that the
EV
range for f/8 is
EV
6
to
23
. Now single out f/8 at ASAIISO
100
in
Section B.
Go
diag-
onally 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 lOa, and
you
will obtain
an
EV
reading of
3. This means that
an
flstop of f/8 at ASAIISO
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 f/8 indi-
cation for ASAIISO
100
in
Section B diagonally down until
it
intersects the horizontal line
in
Section C that leads
to
Section
D's
EV
va
l
ue
of 6 for ASA/ISO
100
, and you will find that the
slowest shutter speed usable
is
1 sec.
In
other words, at f/8 at
ASAIISO
lOa, the available shutter speed range from 1
to
1/2000 sec. has
an
effective
EV
range from
EV
6 to
17
(indicated
by the broken line
in
Section
C)-well
within the metering range.
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