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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.
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
NO
filter (if the scene
is
too bright)
or
supple-
mentary illumination
(if
too dark).
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