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Labomed Inc.

LB-291 Inverted Trinocular Biological Microscope with Infinite Optical System

LB-291 Inverted Trinocular Biological Microscope with Infinite Optical System (Infinity Color Corrected System) is a high level microscope which is specially designed for medical and health units, universities, research institutes to observe cultured living cells. It adopts an Infinite optical system, reasonable structure and ergonomic design. With an innovative optical and structure design, excellent optical performance and easy to operate system, this inverted biological microscope makes your works enjoyable.

Labomed Inc. is certified by ISO 9001, CE Conformity and is FDA Licensed.


  • Excellent optical function with infinite optical system.
  • DSLR (Digital Single Lens Reflex) and microscope digital camera can be used together for image and video capture.
  • Innovative stand structure, sharp image display, convenient and special for viewing incubating cell tissue.
  • With LWD Infinite Plan Objective, Making Viewing Field Flatter and Brighter, Contrast Sharper, Living Cell Observing easier.
  • Advanced and Reliable Mechanical Stage with Knob Height and Tightness Adjustable.
  • With pre-centerable Phase Annulus, Available to Observe Low Contrast or Transparent Specimens.

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Technical Specifications


LB-291 Inverted Trinocular Biological Microscope with Infinite Optical System is used by medical and health units, universities, research institutes for observations of micro-organisms, cells, bacteria and tissue cultivation. It can be used for continuous observation of process of cells, bacteria grow and divide in the culture medium. Videos and images can be taken during the process. This microscope is widely used in cytology, parasitology, oncology, immunology, genetic engineering, industrial microbiology, botany and other fields.

Optical System

Infinite Optical System

Viewing Head

Seidentopf Trinocular Viewing Head, Inclined at 45°, 360° Rotatable, Interpupillary Distance 48-75mm


Wide Field Eyepiece WF10×/ 22, Eyepiece Tube Diameter 30mm


LWD (Long Working Distance)
Infinite Plan Achromatic Objective 4×/ 0.1,WD 22mm

LWD (Long Working Distance) Infinite Plan Achromatic Phase Objective

10×/ 0.25, WD 6mm

20×/ 0.4, WD 3.1mm

40×/ 0.55, WD 2.2mm


Backward Quintuple Nosepiece


ELWD(Extra Long Working Distance) Condenser NA 0.3, LWD 72mm (Without Condenser the WD is 150mm)

Centering Telescope

Centering Telescope (Φ30mm)

Phase Annulus

10×-20×, 40× Phase Annulus Plate(Fixed)


Auxiliary Stages 70mm×180mm
Terasaki Holder
Petri Dish Holder Φ35MM
Slide Glass Holder Φ54MM
Attachable Mechanical Stage, X-Y coaxial control, Moving Range 80 x 120 mm


Coaxial Coarse and Fine Adjustment, Fine Division 0.002mm, Coarse Stroke 37.7mm per Rotation, Fine Stroke 0.2mm per Rotation, Moving Range up 8mm, down 3mm


Halogen Lamp 6V/30W, Brightness Adjustable


Blue, Green and Frosted Glass Filter, Diameter 45mm

Dimension & G.W.

46.5cm*39.5cm*64cm, 18kg


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Labomed, Inc. Mailing Address: 2728 S La Cienega Blvd.
Los Angeles, CA 90034 U.S.A TEL (310) 202-0814  FAX (310) 202-7286

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