E Focus Adjustment
Fig.
18
f
Adjustment Knobs
and
Although
the
tension
of
the
coarse
adjust-
ment knobs
has
been
already adjusted for
optimum performance by the manufacturer.
it
is
possible
to personally adjust the tension
of
the
coarse
adjustment for either heavy or
light movement depending
on
the operator's
preference by rotating
the
tension adjust-
ment ring
<D.
(Fig.
181
The
ring
can
be
rotated by inserting a screwdriver into
one
of the holes
on
the periphery
of
the
ring.
The clockwise rotation
(in
the direction of the
ARROW)
tightens the coarse adjustment
knobs.
Do
not loosen the ring too much, because the
stage
may drop or the fine adjustment
knobs may slip.
CD
1.
Tension
of
Coarse
Fine Adjustment.
NOTE:
Do not rotate the right
and
left
coarse
adjustment knobs
in
the
opposite directions
simultaneously. If the
stage
drops
and
the
specimen
goes
out
of
focus. the tension
adjustment
ring
is
too
loose.
Tighten the
ring.
Use
of Rubber
Cap
for Fine Adjustment Knob,
Attaching this
cap
over
the
fine adjustment
knob
increases
the sensitivity
of
the fine focus-
ing
motion. (The rubber
cap
is
optionally
available.)
2.
Pre-Focusing
Lever
This
lever
ill
is
provided to prevent
possible
contact between
specimen
and
objective
as
well
as
to
simplify
coarse
focusing.
(Fig.
191
The
lever
is
locked after
coarse
focus
has
been
accomplished. This prevents further
upward travel
of
the
stage
by
means
of
the
coarse
adjustment knobs,
and
automatically
provides a limiting stop if the
stage
is
lowered
and
then
raised
again.
The pre-focusing
lever
does
not restrict fine
focusing.
Fig.
19
14
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