Definition of dark-field condenser

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PI Physik Instrumente - Microscope Stages LB ROS 11/24

Photonics Dictionary

dark-field condenser: A condenser that forms a hollow cone-shaped beam of light with its focal point in the plane of the specimen. If it is used with an objective having a numerical aperture lower than the minimum numerical aperture of the hollow beam, the only light that enters the objective is that deviated or scattered by the specimen. The objects are seen as bright images against a dark background.

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