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3-2 Focusing unit (Manual frame only)
1
Focusing operation
2
Adjusting the coarse focusing knob tension
The focusing unit is designed to be lowered (approaching the objective
with the specimen) when the coarse focusing knob
a
or fine focusing
knob
b
is turned in the direction of the arrow.
The tension of the coarse focusing knob is adjustable. Turn the rotation
tension adjustment ring
c
in the direction of the arrow to decrease
the knob’s tension and in the opposite direction to increase it.
} If the focusing unit lowers by its own weight or the focus obtained
with the fine focusing knob
b
is lost soon, the tension is set too
loose. In this case, turn the rotation tension adjustment ring
c
clockwise (opposite direction of the arrow) to increase the tension.
} If it is difficult to rotate the rotation tension adjustment ring, insert the
Allen screwdriver provided with the frame into the hole
d
(either
one of 4 holes) of the adjustment ring and rotate the rotation tension
adjustment ring.
Do not use any tool other than the Allen screwdriver
provided with the frame. Otherwise, the failure may be
caused.
a
b
c
d
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