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Darkfield condensers allow you to render detail in specimens that would otherwise be transparent. Using principles of light-diffraction to suppress field-illumination, the condenser illuminates edges of cells, microorganisms, and other objects. This is particularly useful for live blood analysis. This set includes a dry darkfield condenser for lower magnifications, an oil darkfield condenser for higher magnifications, and a specialized 100X objective lens with a built-in iris to control its aperture for increased contrast. The dry condenser works with objective lenses with numerical apertures below 0.9, including most lenses up to 40X. For higher magnifications, the oil condenser provides optimal brightness and contrast. By placing immersion oil between the oil condenser and the specimen slide, high numerical apertures can be achieved with maximum brightness. While this will work with 100X objective lenses, the darkfield effect loses contrast with increased aperture. A special 100X plan-achromatic darkfield objective lens is included, with the ability to lower its NA through the use of an internal iris. An adjustment collar on the lens allows you to easily adjust the aperture until optimal darkfield is achieved. This set is designed to work with compound microscopes with a 37mm bottom-mount condenser holder. Compatible models include: B340, T340, B400, T400, B450, T450, B460, B490, T490, B590, T590, B600, T600, B680, T680, M220, M600 Condenser Compatibility Condenser Mount Bottom mount Mounting Diameter 37mm Model Compatibility B340, T340, B400, T400, B450, T450, B460, B490, T490, B590, T590, B600, T600, B680, T680, M220, M600 Condenser Specifications (Dry) Numerical Aperture 0.7-0.9 Immersion Medium none Condenser Specifications (Oil) Numerical Aperture 1.25-1.36 Immersion Medium oil Objective Lens Compatibility Optical System Finite Mechanical Tube Length 160mm Mounting Thread RMS 20.32mm Parfocal Distance 45mm Objective Lens Specifications Magnification 100X Numerical Aperture 0.31 to 1.25 Corrections Plan-achromatic Cover-glass Thickness 0.17mm Nosecone Spring Immersion Medium Oil

This is a darkfield condenser with iris for stereo microscopes. It provides advanced darkfield microscopy features. It fits all our stereo microscopes that have a 95mm mounting size. Features & Specifications: 3-3/4" (95mm) in Diameter 1-1/2" (38mm) Overall Height Manufactured under ISO 9001 Quality Control Standards 5-Year Warranty