Olympus 10x Dispersion Staining Objective – Central Stop, Infinity Corrected

The Olympus 10× Dispersion Staining Objective is a specialized lens engineered for rapid refractive index determination through characteristic color effects. This unique objective enables identification of colorless particles by imparting distinctive dispersion colors based on the difference between the particle's refractive index and the mounting medium. Dispersion staining is the gold standard technique for asbestos identification, fiber analysis, and forensic microscopy.

Dispersion staining is a powerful analytical technique that exploits the wavelength-dependent variation in refractive index (dispersion) of materials. When a particle is mounted in a liquid with a similar refractive index, the particle appears colored due to dispersion effects at the particle-liquid interface. Different materials produce characteristic dispersion colors that enable rapid, definitive identification. This technique is particularly valuable for asbestos identification where it provides unambiguous differentiation between fiber types.

At 10× magnification with a numerical aperture of 0.25, this objective provides the optimal combination of field of view and resolution for particle analysis. The moderate magnification enables efficient scanning of samples to locate particles of interest, while the numerical aperture provides sufficient resolution to observe the characteristic dispersion colors and particle morphology essential for identification. This magnification is the standard for dispersion staining applications.

The long working distance of 10.5mm provides generous clearance for sample manipulation and mounting. This extended working distance is particularly valuable when working with dispersion staining mounts, which often require adjustment of the coverslip or addition of mounting media during observation. The clearance also accommodates thicker mounting media layers and reduces the risk of objective contact with the sample.

The central stop design is the key feature that enables dispersion staining effects. This specialized optical configuration includes an annular aperture that blocks the central portion of the light cone while allowing peripheral rays to pass. This creates the oblique illumination conditions necessary for dispersion color effects. When combined with appropriate mounting media and refractive index matching, the central stop produces the characteristic color halos that enable particle identification.

Infinity-corrected optical design ensures compatibility with all modern infinity-corrected microscope systems. The objective works with standard infinity-corrected microscopes from Olympus and other manufacturers, allowing integration into existing microscopy setups. The infinity-corrected design also enables the use of intermediate optical components such as polarizers and analyzers that may be required for certain dispersion staining protocols.

Precision Japanese manufacturing ensures reliable optical performance and consistent dispersion color effects. The robust construction and high-quality optics provide the reproducibility essential for analytical applications where particle identification must be accurate and defensible. This objective is an essential tool for asbestos analysis laboratories, forensic microscopy, and any application requiring rapid refractive index-based particle identification.