Nikon f2 - Manual (Page 41)

STOP-DOWN EXPOSURE MEASUREMENT
Nikon
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-Nikkor 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 continuous overexposure, use a neutral
density filter or slower film. If continuous under­
exposure is indicated, supplementary lighting or a faster
film is necessary. This technique is also suitable for
photography using a telescope or microscope.