Nikon Camera F3AF - Manual (Page 112)

stop-down metering
For stop-down metering, Section A indicates the usable EV
range for various aperture settings. For example, if the lens is
stopped down to f/8 at ASA/ISO 100, refer to the f/8 column in
Section A and the EV values indicated for ASA/ISO 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 ASA/ISO 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 ASA/ISO 100, and you will obtain an EV reading of
3. This means that an f/stop of f/8 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 f/8 indi­
cation for ASA/ISO 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 f/8 at
ASA/ISO 100, 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.
67