Nikon Nikkormar FT3 Manual de instrucciones - Página 15

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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

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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'