Levenhuk 850B Optical Microscope
Levenhuk 850B is a binocular biological microscope that can be used for bright-field observations. It is used in various types of medical institutions for urological, dermatological, biological, biochemical, pathological, cytological, hematological and general clinical laboratory tests. Equipped with a rotating (360?) binocular head with a tilt angle of 30?. 4 lenses can be easily installed into working position using a revolving mechanism. The classic (according to Kohler) type of lighting has the ability to adjust the aperture and field diaphragms. The microscope is focused using coarse and fine adjustment screws. Focusing knobs allow you to move the stage in a vertical plane for precise aiming of the microscope, which remains stationary. The table can also be moved horizontally. The overall size of the table is 140x155 mm. Thanks to the soft focusing stroke and the stage movement mechanism, all adjustments occur smoothly, without jerking. Focusing has the following steps: coarse - 25 mm, fine - 0.002 mm. The microscope is equipped with a built-in 6V/20W halogen lamp, the brightness of which can be adjusted. The optical elements are fully multi-layer coated. A special feature of this model is the ability to conduct observations in a dark field. This method is particularly suitable for hematological studies. The built-in dark field condenser can be used when the Abbe condenser is raised up. To begin dark-field observations, turn the illuminator ring counterclockwise, and to return to bright field, turn the ring clockwise.
- Microscope type: light/optical, biological
- Attachment type: binocular
- Optics material: optical glass
- Nozzle: rotating
- Eyepiece tilt angle: 30°
- Magnification, times: 40–2000
- Eyepiece tube diameter, mm: 23.2
- Eyepieces: paired PLAN WF10x, PLAN WF20x
- Lenses: PLAN WF: 4x, 10x, 40x, 100x (oil)
- Revolving device: for 4 lenses
- Interpupillary distance, mm: 55–75
- Subject table, mm: 140x155
- Range of movement of the subject table, mm: 70x50
- Diopter adjustment of eyepieces, D: ±5
- Condenser: Abbe N.A. 1.25 dark field condenser
- Aperture: Premium iris diaphragm
- Focus: fine: 0.002 mm coarse: 25 mm
- Backlight: halogen
- Brightness adjustment: yes
- Power supply: 220V/50Hz
- Purpose: laboratory/medical
- Illumination location: bottom
- Research method: dark field, bright field