34
3.4.5. Focusing on the Specimen
Focus block
A
2a
1
3a 3b
2b
Illustration 018: NIB610/NIB620 - Sample placement.
Control mechanisms (1) are close to the
user and in low-hand position operation
more quickly and conveniently, and reduce
the fatigue caused by the long observation.
Focusing controls
To adjust the focus, rotate the focusing knobs
(2,3) on the right and left sides of the micro-
scope.
Coarse focusing knobs (3a, 3b):
Pre-focusing, large distance between speci-
men and objective.
Fine focusing knobs (2a, 2b):
The fine focus is used for image sharpness.
Fine and precise regulation of the distance
between the specimen and the objective.
B
Illustration 019: NIB610/NIB620 - Focusing controls.
Correlation between focusing knobs
and objectives
Familiarize yourself with the correlation be-
tween the direction of rotation of the focus-
ing knobs and the vertical movement of the
objectives.
3
C
Illustration 020: NIB610/NIB620 - Focusing mechanism.
Focusing mechanism
From the focal point, up to 7mm and down to
1.5mm, and the limit can be up to 18.5mm.
Spin out the limit screw (3) for about 4mm
trip to limit.
The traveling distance of the objective for
each knob is as follows:
Rotation of knob
Distance traveled by
objective
Fine focus knob:
one rotation
0,2mm
Coarse focus knob:
one rotation
37,7mm
NIB610/NIB620
3
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