Nikon F25B Manuel d'utilisateur télécharger pdf (Page 28)

STOP-DOWN

EXPOSURE

MEASUREMENT

With

some Nikkor lenses, full-aperture exposure

mea-

surement

not possible, either because the lens has

automatic diaphragm, or because the lens does not cou-

ple with the finder's meter; with certain accessories,

too,

lens/finder coupling

not possible, thus, preventing full-

aperture measurement. However, the camera's Photomic

meter can still

used

for exposure measurement

via

the stop-down method. Before mounting the

lens

(or

accessory) on the camera body, push the meter coupling

pin up into the finder with a coin or similar object; when

set, the number

"5.6"

will

appear

the finder's maxi-

mum aperture indicator. After setting the finder, mount

the

lens

or lens/accessory combination on the camera,

switch on the meter

moving the film-advance

lever

the standoff position, and then set the controls for cor-

rect exposure

follows:

For fixed-aperture lenses, such

Reflex-N i kkor lenses,

simply adjust the shutter-speed selector until the center

LED

indicator comes on. For convenience, shutter

speeds can

set at intermediate settings

the 1/80 sec.

to 1/2000

sec.

speed range for precise exposures.

the

meter indicates con tinuous overexposure,

use

a neutral

density filter or slower film. If continuous under-

exposure

indicated, suppleme"ntary lighting or a faster

film

necessary. This technique

also suitable for

photography using a telescope or microscope"

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Nikon F25B Manuel d'utilisateur Page 28

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