Nikon AI-S Micro-NIKKOR 105mm f-2.8 User Manual
Page 12
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The
Micro-Nikkor
105mm
f/2.8
operates
continu
ously
from
infinity
{«■)
to
0.41m
(1.34ft)
for
a
reproduction
ratio
of
1:2.
With
the
PN-11
ring
attached,
focusing
is
extended
to
a
reproduction
ratio of 1:0.88.
To
focus,
first
make
sure
that
the
tightening
screw-
on the focusing ring is loosened. Then, turn the fo
cusing
ring
until
the
image
on
the
focusing
screen
appears sharp. To keep the focusing ring from mov
ing,
be
sure
to
tighten
the
screw.
The
tightening
screw
makes
it
difficult
to
accidentally
move
the
focusing ring, but it does not lock it in place.
The distance scale on the focusing ring is marked in
both
meters
(white)
and
feet
(yellow).
These
figures
indicate
the
distance
from
the
subject
to
the
camera’s
film
plane.
The
exact
position
of
the
film
plane
is
indicated
on
all
cameras
for
convenience
when
precise
measurement
of
the
distance
is
re
quired.
(For
more
details,
check
your
camera’s
instruction manual).
• Although it is possible to turn the focusing ring
with the screw tightened, do not attempt it.
• At the closest distance setting, the lens focal length
is approx. 82mm.