The upper illuminator is provided with an iris diaphragm. Values corresponding to the telescope are located on the scale opposite to each other. Releasing the clamping knob allows the vertical travel of the tube as well as its rotation around the stand. The body with the tube drive is provided with a mechanism which allows smooth shift of the tube being controlled by simultaneous rotation of the L.H. and R.H. knobs in opposite directions. The microscope total magnification can be obtained by multiplying the objective magnification by the eyepiece magnification. After unscrewing the screw should be kept in its socket in the case. The prism in a mount is being fixed in an objective so that the vertical white line on the mount always coincides with the microscope tube vertical axis (firm trade mark axis) (Photo 16). The prism is immobilized with a clamping knob. The magnification changer telescopes are corrected specially accurately as they work in both directions. The value of the magnification is being shown by the indicator. The plate is painted in white on one side while in black on the other, thus enabling to achieve proper contrast during observation. After having released the set-screw the arm with the illuminator can be rotated around the objective.
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- The microscope stand of simple and soil id construction assures convenient observation.
- Releasing the clamping knob located in the stand allows full rotation of the guide-rod together with the body including the tube driving gear without changing sharpness of the image.
- The microscope tube is fixed to the guide-rod.
The magnification changer drum, by means of which quick change of magnification with constant working distance can be achieved, is embodied in the microscoDe tube. The stage is immobilized by means of a setscrew (Photo 1, item 20). The table can be rotated by 360° and shifted by 10 mm from its central position in horizontal this making possible comfortable observation and inspection of larger surfaces. The magnification series on the changer scale is the following: 0.63X; 1.0X; 1.6X; 4X; 2.5X; 1.6X; Total magnifications and corresponding diameter of fields of view are given in the Table below: OPERATION The stereomicroscope is fixed with a screw to the case bottom for transport. The magnification change is effected by turning a knurled knob with the objective magnification range engraved on it. The main objective with focal distance 100 mm and diameter 45 mm is a four-lens abjective. As far as its correction is concerned the objective is comparable to modern photographic objectives. The holder ensures clamping objects in dimensions from 2 to 6 mm. PRISM FOR VERTICAL ILLUMINATION The prism in a special mount, serving for vertical directing of a strong light path from the illuminator to the examined spot, js used for examining holes, slots, smell bores etc. The eyepiece magnifications are engraved on the mounts. The stage for transmitted light work is provided with hand-rests movable around the stage periphery which ensure easy and comfortable operation, especially during preparation. Using the stage for transmitted light work the illuminator light path is to be directed by a fiat mirror. The eyepiece tubes spacing can be adjusted to suit the pupils distance of observer’s eyes. The L.H. eyepiece tube is, provided with focusing control collar.
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The main objective with folding arm and illuminator is being mounted in the microscope tube. The illuminator is provided with a condenser, iris diaphragm and mat blue filter assuring pleasant and uniform illumination of the observed preparation. The transformer is stored in a cardboard box. OPTICAL CHARACTERISTICS The optical system of the stereomicroscope MST131 is composed of the following main elements: illuminator, main objective, magnification changer, tube lenses, Schmidt’s roof prisms and eyepieces. The microscopic slide plate applied for observation in reflected light and the clips holding the preparation are being inserted into the microscope body socket. Scale engraved on the tube corresponds to the eyepiece 6.3X. The microscope equipment comprises: the wide field eyepiece 6.3X and 25X and eysshields. A separate stage on which the microscope is placed is being used for observation in transmitted light. The stage surface is covered with rubber plate which protects objects placed on it against sliding down when inclining the stage. All external surfaces of the optical elements, e.g. main objective, telescopes in the magnification changer drum, inclined body, eyepieces and illuminating system must be cleaned with a special soft flannel rag or beaver brush only. The eyepiece have the large field of view.
Longitudinal and transverse shift values can be read on the scales provided with verniers which allow the reading with an accuracy of 0.1 mm. The stage surface is provided with a mat glass plate. For work the microscope can be set as required, however the most convenient position of the microscope is with its stand towards the observer. The microscope together with its equipment is stored in a wooden case locked with a key. The objective magnification is read on the magnification changer scale. The stage for transmitted-light work is placed in a separate case locked with latches. The inclined eyepiece body mounted in the tube upper part is being fixed by means of a setscrew. The weaker telescope introduces 2.5X factor and in reversed position 1.0X factor, while the stronger telescope introduces 4X and 0.63X factors respectively.
The Schmidt’s roof prisms serve the two purposes: — to erect the image — deflection at 45° from the vertical — to provide changing the interocular distance to suit the observer. The stage is immobilized by means of a setscrew (Photo 1, item 20). The stage can be shifted in longitudinal direction within the range of 30 mm and transverse direction within the range of 65 mm. The microscope is composed of the following fundamental elements: base with stand, tube with main objective, illuminator and magnification changer, inclined stereoscopic binocular body, eyepieces and stage for transmitted light work together with embodied illuminator. For eventual differences between description and instrument itself we apologize to our users. Colour light filters can be put on the illuminators. For observation in artificial transmitted light a mat glass plate is being inserted into the microscope base hole, while for observation in transmitted day-light a clear glass plate is being used.
The total magnification value can be also selected according to the magnification Table. With telescopes properly set, engagement of a ratchet located inside the body can be felt. The magnification changer is composed of two pairs of Gallilean telescopes mounted in a rotary drum provided also with an opening. Figure 1.6 on the scale corresponds to the objective magnification with the engaged passage opening of the magnification changer drum. Apart from the cross shifts the stage can be rotated around its axis by 360°. The stage is immobilized by turning a knob located in the adapter. Skip to: Content | | Footer — A great place to buy computers, computer parts, electronics, software, accessories, and DVDs online. The upper and lower illuminator are each composed of a bulb 6V/20W and a 2-lens condenser. The polarising device consists of an adapter with the polariser, the circular stage with the glass plate, the specimen holder, the analyser and the second polariser, which is put on the illuminator of the microscope base.