Olympus BHS Instruction Manual - Page 15
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E.
Focus Adjustment
1. Tension
of
Coarse
Adjustment
Knobs
and
Fine Adjustment.
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 ©.
(Fig. 17)
Fig. 17
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 adjust-
ment
knobs.
Do
not
loosen
the ring
too
much,
because
the stage
may
drop
or the fine
adjustment knobs may slip.
NOTE:
Do not rotate the right and
left coarse adjustment knobs in the opposite directions
simultaneously.
М the stage drops and the specimen goes out of focus, the tension
adjustment ring is too loose.
Tighten
the ring.
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 @ is provided to prevent possible
contact between specimen and objective as
well as to simplify coarse focusing. (Fig. 18)
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.
3. Adjustment of Stage Block Height
In addition to the vertical movement of the
stage
by
means
of
coarse
and
fine adjust-
ments, the stage block height can be changed
for
observation
of
specimens
which
are
thicker
than
standard
slides, e.g. chambers,
flasks, etc. with much larger thickness.
The
stage block height can be adjusted by
loosening the stage block locking screw with
the Allen
wrench provided
and retightening
it at the appropriate position.
(Fig. 19)