Meter Coupling Lever; For Lenses Or Accessories Without Automatic Diaphragms; For Fixed -Aperture Lenses . Photomicrography; Or Astrophotography - Nikon FG-20 Instruction Manual

Meter Coupling Lever
@
is lever couples with the lens' meter coupling ridge
® on the aperture ring to perform full-aperture meter-
ing. Lenses whose aperture ring doesn 't couple with
this lever can not be used. For the following lenses,
stop-down exposure measurement must be per-
formed.
For lenses or accessories without automatic
diaphragms
When a PC-Nikkor lens or bellows attachment is
used, focusing should be done with the lens wide
open while exposure measurement and shooting
must be done with the lens stopped down .
• With
a
PC-Nikkor, the correct exposure must be determined
on manual before shifting the lens.
For fixed-aperture lenses, photomicro-
graphy, or astrophotography
Since the aperture is fixed when using Reflex-Nikkor
lenses, or in photomicrography or telescopic photog-
raphy, it is impossible to change the exposure by
varying the aperture. So, on auto, take the shot by
simply depressing the shutter release button. On
manual , turn the shutter speed/mode selector dial
until the correct exposure is obtained. If the scene is
too bright to obtain correct exposure, use an NO filter.
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