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STOP-DOWN
EXPOSURE
MEASUREMENT
28
With
some Nikkor lenses, full-aperture exposure
mea-
surement
is
not possible, either because the lens has
no
automatic diaphragm, or because the lens does not cou-
ple with the finder's meter; with certain accessories,
too,
lens/finder coupling
is
not possible, thus, preventing full-
aperture measurement. However, the camera's Photomic
meter can still
be
used
for exposure measurement
via
the stop-down method. Before mounting the
lens
(or
accessory) on the camera body, push the meter coupling
pin up into the finder with a coin or similar object; when
set, the number
"5.6"
will
appear
in
the finder's maxi-
mum aperture indicator. After setting the finder, mount
the
lens
or lens/accessory combination on the camera,
switch on the meter
by
moving the film-advance
lever
to
the standoff position, and then set the controls for cor-
rect exposure
as
follows:
For fixed-aperture lenses, such
as
Reflex-N i kkor lenses,
simply adjust the shutter-speed selector until the center
LED
indicator comes on. For convenience, shutter
speeds can
be
set at intermediate settings
in
the 1/80 sec.
to 1/2000
sec.
speed range for precise exposures.
If
the
meter indicates con tinuous overexposure,
use
a neutral
density filter or slower film. If continuous under-
exposure
is
indicated, suppleme"ntary lighting or a faster
film
is
necessary. This technique
is
also suitable for
photography using a telescope or microscope"