Nikon Epiphot 300 Manual page 49

I I. Focusing DeYice
• The rotation of the coarse f o cus and fine focus knobs
move the revolving nosepiece vertically. A sample
placed on the stage can be focused by rotating these
focus knobs. Figure right shows the relation between
their rotation and the nosepiece movement.
• One rotation of the fine focus knob moves the
nosepiece 0.1 mm. The minimum reading of the scale
on the fine f o cus knob moves the nosepiece 1 µm.
• Rotation of the coarse focus torque adjustment ring
adjusts the tension felt in the rotation of the coarse
focus knob. Rotating this adjustment ring counter­
clockwise increases this tension.
---------------------------------,
►
Never rotate simultaneously the
right and left focus knobs in
opposite directions. If rotated
this way, they may cause
malfunction.
�------- -------- -------- -------- --
Coarse focus torque
adjustment ring
I
"
0
m
0
m
►
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�
=l
42