Stop-down exposure metering – Nikon F4 User Manual
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Stop-Down Exposure Metering
For lenses and other systems without automatic
diaphragms
When the automatic diaphragm ring does not 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 AE 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.