Nikon Photomic FTN Finder Instruction Manual - Page 19
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Bellows Focusing Attachments, Extension Rings
and Focusing
Unit
To determine exposure,
select
the desired
shutter
speed and
stop down the
lens
manually
until
the needle centers.
Preset
Lenses
Use the same procedure
as
above for lenses
having
preset
diaphragms, such
as
the PC-Nikkor 35mm f/2.8.
Auto Lenses Without Coupling Prong
Some lenses
like
the Zoom-Nikkor Auto 200-600mm f/9.5
have an auto diaphragm but no coupling prong. Use the
depth-of-field
preview
button
to
stop down the
lens
until
the
needle is centered.
Reflex-Nikkor Lenses
The Reflex-Nikkor 500mm f/8, IOOOmm fill and 2000mm
f/11
lenses
have no aperture diaphragm. Adjust the shutter
speed until the
needle
is ceniered.
Note: Since focusing may be difficult or
impossible
at small
apertures
due
to
image
darkening on
the
screen, first open
the
lens to
full aperture to focus. Then
determine
the correct
exposure by the
stop-down
method.
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