Stop-Down Exposure Metering
For lenses and other systems without automatic
diaphragms
When the automatic diaphragm ring does hot couple with the
meter coupling lever of the camera, such as when using a
PC-Nikkor reflex mirror or bellows attachment, focusing should
be done with the lens wide open while exposure measurement
and shooting must be done with the lens stopped down.
In A mode:
Take the picture with the lens stopped down. With a PC-
Nikkor, correct exposure must be determined before
shifting the perspective. To do this, first use the AЕ Lock;
the lens can then be shifted to take the shot.
In M mode:
Stop down the lens to determine the correct exposure, then
take the picture.
For lenses with fixed apertures
Because the aperture of a Reflex-Nikkor lens is fixed, in photo-
micrography or telescopic photography, it is impossible to
change the exposure by varying the aperture.
In A mode:
The F4's computer will automatically adjust the shutter
speed. Take the picture by simply depressing the shutter
release button.
In M mode:
Select the appropriate shutter speed (in 1 EV steps) for
correct exposure. If a correct exposure cannot be obtained,
use either an ND filter (if the scene is too bright) or supple-
mentary illumination (if too dark).
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