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Magnification: 40–1000x. Binocular head, infinity plan achromatic objectives, 30W halogen bulb

The microscope head is a core element of the microscope that you look through to see a magnified sample
40–1000 basic configuration (*optional: 40–1200/1250/1500/1600/2000/2500)
How much the size of a sample increases when you observe it through a microscope
Application and use of the microscope

Product ID 82888
Warranty 5 years
EAN 5905555018003
Package size (LxWxH) 16.9x10.6x24.8 in
Shipping Weight 22.1 lb

MAGUS Bio 250B biological microscope is an optical instrument used for studying thin transparent and translucent objects. Brightfield microscopy in transmitted light is the main microscopy technique. The microscope can be equipped with additional accessories for using darkfield, phase contrast, and polarization techniques. High-quality optics with additional options to expand its capabilities, easy-to-use mechanics, and smart design make this microscope an excellent choice for lab work, research, and teaching.


The binocular head allows you to mount a digital camera in one of the eyepiece tubes (camera not included). The tubes can be rotated 360° to obtain a comfortable position to fit the height of the observer. The diopter adjustment ring is located on the left tube.

The revolving nosepiece allows for mounting 5 objectives. The microscope comes with infinity plan achromatic objectives that provide clear, high-contrast images across the entire field of view. There is a single free slot in the revolving nosepiece for mounting an additional objective. The revolving nosepiece with objectives is oriented toward the interior so that the user can see the objectives inserted into the optical path, and the space above the stage is free.

The microscope optics in the basic configuration provides magnification from 40 to 1000x. The use of additional eyepieces, if necessary, allows you to increase the upper limit of the magnification range.


Light source: 30W halogen bulb. It provides uniform and bright illumination of the sample using any objective lens and any observation method, including darkfield and phase contrast techniques. The warm spectrum of light is pleasing and comfortable for the eyes, so they will not get tired even when working with the microscope for long periods of time.

The Abbe condenser has a slot for mounting a darkfield or phase slider. The condenser design simplifies and speeds up the process of switching research techniques. The condenser is height-adjustable and can be centered. The field diaphragm makes it possible to set up the Köhler illumination.

Stage and focusing mechanism

The stage is equipped with a mechanical attachment that can be removed for manual scanning. There is no positioning rack that ensures the ergonomic operation of the stage.

Focus adjustment is adjusted by the coaxial coarse and fine focusing knobs on both sides of the microscope body. The mechanism is smooth and precise, and no effort is required to rotate the knobs. The coarse focusing has a lock knob and tension adjustment. The focusing knobs are located at the bottom. Therefore, you can rest your hands on the table rather than holding your arms in the air. It increases comfort during long work sessions.


A wide range of accessories allows the MAGUS Bio 250B to be configured in the most convenient way for the user. Eyepieces, lenses, darkfield, phase contrast and polarization devices, calibration slides, and digital cameras are available.

Key features:

  • Infinity plan achromatic objectives
  • Binocular head with an option of mounting a digital camera in one of the eyepiece tubes, diopter adjustment on the left tube
  • The height of the binocular head can be adjusted by rotating the eyepiece tubes 360°
  • Coaxial coarse & fine focusing knobs, coarse focusing tension adjusting knob, coarse focusing lock knob
  • Field diaphragm for setting up the Köhler illumination
  • Slot in condenser for installing a slider: darkfield or phase slider
  • 30W halogen lamp for working in transmitted light
  • Option to install additional accessories

The kit includes:

  • Base with a power input, transmitted light source, focusing mechanism, stage, condenser mount, and revolving nosepiece
  • Abbe condenser
  • Binocular head
  • Infinity plan achromatic objective: 4x/0.10
  • Infinity plan achromatic objective: 10x/0.25
  • Infinity plan achromatic objective: 40x/0.65 (spring-loaded)
  • Infinity plan achromatic objective: 100x/1.25 oil (spring-loaded)
  • Eyepiece 10x/22mm with a long eye relief (2 pcs.)
  • Eyecup (2 pcs.)
  • Filter (4 pcs.)
  • Bottle of the immersion oil
  • AC power cord
  • Dust cover
  • User manual and warranty card

Available on request:

  • 10x/22mm eyepiece with scale
  • 12.5x/14mm eyepiece (2 pcs.)
  • 15x/15mm eyepiece (2 pcs.)
  • 20x/12mm eyepiece (2 pcs.)
  • 25x/9mm eyepiece (2 pcs.)
  • Infinity plan achromatic objective: 20x/0.40
  • Infinity plan achromatic objective: 60x/0.80 (spring-loaded)
  • Phase-contrast device
  • Phase slider
  • Darkfield condenser NA 0.9
  • Oil darkfield condenser NA 1.36–1.25
  • Darkfield slider
  • Polarization devices
  • Digital camera
  • Calibration slide
  • C-mount adapter
  • Adapter ring
  • LCD Monitor
Product ID 82888
Warranty 5 years
EAN 5905555018003
Package size (LxWxH) 16.9x10.6x24.8 in
Shipping Weight 22.1 lb
Type biological, light/optical
Head binocular
Nozzle Gemel head (Siedentopf, 360° rotation)
Head inclination angle 30 °
Magnification, x 40–1000 basic configuration (*optional: 40–1200/1250/1500/1600/2000/2500)
Eyepiece tube diameter, in 1.2
Eyepieces 10х/22mm, eye relief: 10mm (*optional: 10x/22mm with scale, 12.5x/14; 15x/15; 20x/12; 25x/9)
Objectives infinity plan achromatic: 4x/0.10; 10x/0.25; 40xs/0.65; 100xs/1.25 (oil); parfocal distance: 45mm (*optional: 20x/0.40; 60хs/0.80)
Revolving nosepiece for 5 objectives
Working distance, mm 21 (4x); 5 (10x); 0.66 (40xs); 0.36 (100xs); 8.8 (20x); 0.465 (60xs)
Interpupillary distance, in 1.9 — 3
Stage, mm 180x150
Stage moving range, mm 75/50
Stage features two-axis mechanical stage, without a positioning rack
Eyepiece diopter adjustment, diopters ±5 (on the left tube)
Condenser Abbe condenser, N.A. 1.25, center-adjustable, height-adjustable, adjustable aperture diaphragm, a slot for a darkfield slider and phase contrast slider, dovetail mount
Diaphragm adjustable aperture diaphragm, adjustable iris field diaphragm
Focus coaxial, coarse focusing (21mm, 39.8mm/circle, with a lock knob and tension adjusting knob) and fine focusing (0.002mm)
Illumination halogen
Brightness adjustment
Power supply 220±22V, 50Hz, AC network
Light source type 12V/30W halogen bulb, G4
Light filters yes
Operating temperature range, °F 41...+95
Ability to connect additional equipment phase contrast device (condenser and objectives), darkfield condenser (dry or oil), polarization devices (polarizer and analyzer)
User level experienced users, professionals
Assembly and installation difficulty level complicated
Application laboratory/medical
Illumination location lower
Research method bright field
Pouch/case/bag in set dust cover
Weight, lbs 17.6
Dimensions, in 200x436x400
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