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[Bel Engineering holds the right to make technical or other modifications to its products without prior warning] Bel Photonics BIO2_User manual_REV1.5.doc
4. Coarse and fine focusing.
The instrument uses coaxial coarse/fine focusing mechanism. With reference to figure 6: the
knob 3a is for macrometric focus, the knob 3 for the fine focus.. --- After positioning the specimen
onto the stage, first act on the coarse focus knob to get near the focalization plane, then optimize
the focus of the image through the fine focus knob.
The lever 4 is for adjusting the tension of the coarse focusing knob to prevent the stage from
naturally sliding down; regulate this according to your preferences and requirements. The lever 5 is
the limiting lever and prevents accidental specimen-objective contact; unblock the lever, bring the
specimen stage to a end of stroke position suitable for your requirements and then block again the
lever.
5. Condenser positioning
With reference to figure 7: the condenser can be displaced up and down acting on the knob 6. It
can also be easily removed from its support unscrewing its central holding screw. The side screws
9 allow the centering of the position of condenser (see section V.a). The opening of the condenser’s
aperture diaphragm can be regulated acting on the lever 7, rotating this to the right and to the left.
Regulating the opening of the aperture diaphragm you can obtain an appropriate contrast (see
section V.a). The filter seat 8 allows the placement of color round filter in the optical light path.
6.Specimen stage
3
3a 4
5
Fig.6
6
9
7
8
Fig.7
