Nikon Nikkormar FT3 - Stop-Down Exposure Measurement

Stop-Down Exposure Measurement
With some lenses and accessories, full-aperture expo-
sure measurement is not possible, either because the
lens has no au tomatic aperture diaphragm or because
the diaphragm will not couple to the meter. In these
cases, the stop-down metering method must be used.
This means that you must determine the exposure
with the lens aperture diaphragm stopped down to
the taking aperture.
To set the meter for stop-down metering, depress the
coupling lever release and push up the meter coupling
lever. To avoid accidental damage, make sure you do
not use excessive force when raising up the lever. You
can now mount the lens or accessory as you would an
ordinary lens. The meter is switched on in the usual
way.
Nikkormat lCll
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For automatic diaphragm lenses without a meter
coupling ridge, set the desired shutter speed; then, de-
press the depth-of-field preview button to stop down
the lens aperture diaphragm; keeping the button de-
pressed, adjust the aperture ring until the meter nee-
dle
indicates correct exposure. Be sure to release the
preview button before making the exposure.
For fixed-aperture lenses, such as Reflex-Nikkor
lenses, simply adjust the shu tter speed until the nee-
dle is
centered.
For bellows units, extension rings .and preset lenses,
set the desired shutter speed; then, stop down the
lens manually until the needle is centered.
Since focusing may be difficult or impossible at small
apertures , due to viewfinder darkening, you are
advised
to focus first at full aperture. Then , stop
down the lens to determine the exposure '.
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