Nikon F3 High-Eyepoint Instruction Manual page 34

· - 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.