Nikon DIAPHOT 300 - Focusing Device.33

14. Focusing Device
The arrows in the figure below show the directions in which you rotate the coaxial
coarse/fine focusing knob to move the objectives.
The following shows the relationship between rotation of the knobs and movement of
objective:
One scale division on the fine focusing knob gives 1 /iim of objective movement.
One rotation of the fine focusing knob gives 0.1 mm of objective movement.
One rotation of the coarse focusing knob gives 4mm of objective movement.
The coarse/fine focusing knobs provide a 7-mm upward stroke and 3-rnm
downward stroke from the reference position.
Counterclockwise rotation of the torque adjustment ring on the right handle
increases rotary resistance of the coarse focusing knob.
NOTE
• Never turn the right and left knobs of the microscope base in
the opposite directions at the same time. Failure may result.
• Once the coarse focusing knob has reached its limit, do not
force the knob beyond the limit. Failure may result.
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