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Lens Aperture Coupling
The Photomic
FTN takes
advantage of the automatic dia-
phragm feature of Nikkor lenses to measure light with the
lens
wide
open.
Full-aperture
metering gives a bright, clear
finder image for viewing
and
focusing
and
minimizes the
effect
of light
entering the
viewfinder
from
the rear.
In
order
for the meter to measure exposure at full aperture
with
lenses of different maximum
aperture,
it must be
cou-
pled with the maximum aperture of the lens in use. This is
done
each
time the lens is
attached
or
changed
by turning
the
aperture
ring
of
the lens through its
entire
range.
With the lens mounted
on
the
camera,
twist the aperture
ring
counterclockwise
,
then clockwise
as far
as it
will go.
This
meshes the
coupling
prong on the lens
with
the pin on
the Photomic
FTN
Finder and adjusts
the meter for the
maximum
aperture
of the lens.
The
adjustment can be
verified by
checking
the maximum
aperture scale on
the
front
of the
finder.
The
scale
has
a
range from
f/
1.2 to
f/5.6.
For
example
,
if the 50mm
f/
1.4
lens
is mounted
on
the
camera,
the red index mark
should
appear between 1.2
and
2.8.
For
instructions for mounting and removing
lenses, see
the
Instruction Booklet for the Nikon
F
.
Nikon
11
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