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SETTING
THE
APERTURE
6
The PC-Nikkor
is
provided with a manual diaphragm
operable from f/2.8 to f/32 and a spring-loaded preset
ring to
aid
in
setting the diaphragm quickly to the
shooting aperture; a total of eight click-stop positions,
at
full
-stop intervals, makes for precise placement of
the preset
ring.
Also, identical sets
of
f/numbers are
engraved
on
opposite sides
of
the front
rim
of
the
lens
to facilitate operation
when
the
lens
is
used inverted.
To set the aperture, the following procedure
is
recom-
mended:
Press
the preset ring toward the camera body
and turn it until the f/number setting corresponding
to the desired shooting aperture
is
aligned with the
ring's index dot; then release the ring and it
will
spring
outward and lock
in
place. Note that the preset
ring,
once set, limits the travel
of
the aperture
ring
so
th
at
the diaphragm can
be
set easily and quickly from the
full
aperture viewing position to the shooting aperture
without the need for checking the scale during stop-
down operation.