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Chapter 3 Usage of Components
67
3.11 Using the Focusing Device
3.11.1 Focusing on the Sample
Turning the focus knobs on the microscope main body moves the objective vertically, enabling the user to
focus on the specimen.
The focus knobs are divided into the following two
types. The coarse-focus knob is used to vertically
move the objective a large distance, while the
fine-focus knob is used to move the objective
vertically in small steps.
Operation:
Move the focusing device in fine-motion.
Focus knob
Focusing device
Turn the fine-focus knob
to the front
(in the direction of the
UP arrow).
The focusing device
moves upward
in fine-motion mode.
Turn the fine-focus knob
to the rear
(in the opposite direction
of the UP arrow).
The focusing device
moves downward
in fine-motion mode.
Move the focusing device in coarse-motion.
Focus knob
Focusing device
Turn the coarse-focus
knob to the front
(in the direction of the
UP arrow).
The focusing device
moves upward
in coarse-motion mode.
Turn the coarse-focus
knob to the rear
(in the opposite direction
to the UP arrow).
The focusing device
moves downward
in coarse-motion mode.
Degree of objective movement:
The following table shows the degree of objective
movement when the focus knobs are turned.
Degree of knob rotation
Degree of objective
movement
One graduation step of
the fine-focus knob
1
μ
m
One turn of the
fine-focus knob
0.1 mm
One turn of the
coarse-focus knob
5 mm
Close the shutter
before opening the cover
of the filter cube slot.
C
S.
F.
Elevating movement of the focusing device (objective)
1.5x
Operating the focus knobs
Movement stroke of the focusing device
The movement stroke of the focusing device is about 8 mm above and about 2 mm below the reference
position.
Points on focusing
•
When using the coarse-focus knob to move the objective upward, keep your eyes away from the
eyepieces, and operate the knob while checking the distance between the specimen and the objective,
taking care not to let the objective touch the specimen.
•
When moving the objective with the coarse-focus knob while looking through the eyepieces, always
move the objective downward.
•
Lower magnification objectives are easier to focus. First use a lower magnification objective to focus,
and then switch it to a higher magnification objective.
Fine-focus
knob
Coarse-focus
knob
Fine-focus
knob
Coarse-focus
knob