Digital Laboratory Biological Microscope XS-208 Series
Compound biological microscope with binocular head, 4X-100X achromatic objectives, mechanical stage, and Abbe condenser for brightfield examination of biological specimens.
Louise Corscadden, PhD
Neuroscience · ConductScience
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The Digital Laboratory Biological Microscope XS-208 Series is a compound brightfield microscope designed for biological specimen examination in research and clinical laboratory environments. The system features a 45° tilted sliding binocular observation head with wide-angle WF10X/18mm eyepieces and achromatic objective lenses ranging from 4X to 100X oil immersion magnification. The microscope incorporates a double-layer mechanical stage (135×140mm) with precision movement controls and an Abbe NA1.25 condenser with variable aperture and rack-and-pinion focusing adjustment.
Built-in illumination provides consistent sample visualization, while the multi-roller four-aperture objective converter allows rapid magnification changes. Optional accessories include darkfield condenser and phase contrast components for specialized contrast enhancement techniques. The system operates on universal AC power (100-240V, 50/60Hz) and includes foam packaging for secure transport and storage.
How It Works
The XS-208 Series operates on transmitted light brightfield microscopy principles, where white light from the built-in illumination source passes through the specimen and objective lens system to form a magnified image. The Abbe condenser with NA1.25 numerical aperture focuses and controls the light cone entering the specimen plane, optimizing resolution and contrast through variable aperture adjustment. Light transmitted through the specimen carries morphological and optical density information that is captured by the achromatic objective lenses.
The achromatic objective design corrects for chromatic aberration across the visible spectrum, providing sharp, color-accurate images at magnifications from 40X (4X objective × 10X eyepiece) to 1000X (100X oil immersion objective × 10X eyepiece). The binocular observation head splits the light path between two eyepieces, enabling comfortable stereoscopic viewing while maintaining full resolution. The mechanical stage provides precise XY positioning with micrometer-level control for systematic specimen scanning and coordinate-based sample navigation.
Optional phase contrast accessories enhance visualization of transparent specimens by converting phase differences into amplitude variations, revealing cellular details not visible under standard brightfield conditions. The darkfield condenser option enables observation of unstained living specimens by illuminating only scattered light, creating bright objects against dark backgrounds for improved contrast of fine structural details.
Features & Benefits
Automation Level
- manual
XS-208A
- XS-208B
XS-208C
- XS-208AP
XS-208BP
- XS-208AB
Observation Head
- 45° tilt sliding binocular observation head
Nosepiece
- Multi-roller four-aperture objective lens converter
√
- √
Eyepiece
- Wide-angle plane eyepiece: WF10X/18mm
Objective Lens
- Achromatic 4X, 10X, 40X(spring), 100X(spring, oil)
Stage
- Double-layer mechanical platform 135*140mm
Condenser
- ABBE NA1.25 condenser with variable aperture and filters, rack and pinion adjustment
Illumination
- Built-in lighting
Optional Accessories
- Darkfield condenser, phase contrast accessories
Package
- Foam carton
Brand
- ConductScience
Research Domain
- Cell Biology
- Clinical Diagnostics
- Developmental Biology
- Histopathology
- Microbiology
- Pharmaceutical QC
Power/Voltage
- AC100~240V, 50/60Hz
Weight
- 8.0 kg
Dimensions
- L: 46.0 mm
- W: 25.0 mm
- H: 36.0 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Objective Magnification Range | 4X to 100X oil immersion with achromatic correction | Entry-level models often provide 4X to 40X without oil immersion capability | Oil immersion enables 1000X magnification for bacterial identification and high-resolution cellular analysis |
| Condenser Specifications | Abbe NA1.25 with variable aperture and rack-and-pinion adjustment | Basic models use fixed-aperture condensers with lower numerical aperture | Variable aperture control optimizes resolution and contrast for each magnification level |
| Stage Design | Double-layer mechanical stage 135×140mm with precision controls | Single-layer stages with limited positioning accuracy | Mechanical precision enables systematic specimen scanning and coordinate-based sample navigation |
| Observation System | 45° tilted sliding binocular head with WF10X/18mm eyepieces | Monocular heads or fixed binocular systems with narrower field eyepieces | Ergonomic viewing reduces fatigue during extended observation sessions while wide-angle eyepieces improve scanning efficiency |
| Spring-Loaded Objectives | 40X and 100X objectives with spring protection | Fixed objectives without impact protection mechanisms | Prevents objective damage during focusing, protecting expensive high-magnification lenses in routine use |
The XS-208 Series provides research-grade optical performance with achromatic correction, high-numerical-aperture condenser, and mechanical precision suitable for professional laboratory environments. The spring-loaded high-magnification objectives and ergonomic binocular design support extended use in demanding research applications.
Practical Tips
Center the condenser using a low-magnification objective by closing the aperture diaphragm and adjusting centering screws until the aperture image is centered in the field.
Why: Proper condenser centering ensures uniform illumination and optimal resolution across all magnification levels.
Clean objective lenses weekly using lens paper and appropriate cleaning solution, working from center outward in circular motions.
Why: Oil residue and debris on objectives degrade image quality and can permanently damage lens coatings if not removed properly.
Always start observations with the 4X objective and progress to higher magnifications to locate areas of interest efficiently.
Why: Low magnification provides context for specimen orientation and prevents damage to high-magnification objectives during initial focusing.
Use immersion oil sparingly on the 100X objective, applying only enough to fill the space between objective and specimen without overflow.
Why: Excess oil can contaminate lower-magnification objectives and create optical artifacts that reduce image clarity.
If image appears dim or uneven, check condenser height and aperture settings before adjusting illumination intensity.
Why: Improper condenser alignment causes more imaging problems than insufficient light intensity and should be corrected first.
Allow the illumination system to stabilize for 5-10 minutes before critical observations to ensure consistent color temperature.
Why: Thermal stabilization prevents color shifts and brightness variations that can affect quantitative measurements and image documentation.
Avoid using solvents near the microscope base or electrical components; clean only optical surfaces with appropriate lens cleaners.
Why: Chemical vapors can damage internal components and create safety hazards in laboratory environments with sensitive equipment.
Setup Guide
What’s in the Box
- Digital Laboratory Biological Microscope XS-208 main unit
- Wide-angle WF10X/18mm eyepieces (pair)
- Achromatic objective lenses: 4X, 10X, 40X (spring), 100X (spring, oil)
- Abbe NA1.25 condenser with variable aperture
- Power cord with universal AC adapter
- Immersion oil for 100X objective (typical)
- Dust cover (typical)
- User manual and operation guide (typical)
- Foam carton packaging
Warranty
ConductScience provides a standard one-year manufacturer warranty covering defects in materials and workmanship, with technical support for setup, calibration, and operational guidance. Extended service plans are available for laboratory environments requiring scheduled maintenance protocols.
Compliance
What is the numerical aperture range supported by the condenser system?
The Abbe condenser provides NA1.25 numerical aperture with variable aperture control, supporting the full numerical aperture range of the objective lens set from 4X to 100X oil immersion.
Can this microscope accommodate phase contrast imaging?
Yes, phase contrast accessories are available as optional components, requiring phase contrast objectives and condenser annuli for enhanced visualization of transparent specimens.
What slide formats are compatible with the mechanical stage?
The 135×140mm mechanical stage accommodates standard 75×25mm microscope slides, multi-well plates, and Petri dishes with secure specimen clips and precise XY positioning controls.
How is interpupillary distance adjusted for different users?
The sliding binocular observation head allows interpupillary adjustment from approximately 55-75mm by sliding the eyepiece tubes to match individual user requirements.
What immersion oil specifications are required for the 100X objective?
The 100X oil immersion objective requires standard microscopy immersion oil with refractive index 1.515 at 23°C for optimal resolution and numerical aperture performance.
Are the spring-loaded objectives user-replaceable?
Yes, the 40X and 100X spring-loaded objectives thread into the multi-roller nosepiece converter and can be replaced by users following proper handling procedures to avoid damage to lens elements.
What maintenance is required for the mechanical stage?
The mechanical stage requires periodic cleaning of guide rails and lubrication of adjustment mechanisms according to usage intensity, typically monthly for heavy-use environments.
Can darkfield imaging be performed with this microscope?
Yes, a darkfield condenser is available as an optional accessory, replacing the standard Abbe condenser for darkfield illumination of unstained living specimens.
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