The present invention is an improved illumination system which achieves enhanced spatial resolution and contrast in the observation of small objects. The enhanced performance is achieved by using a metal-halide light source, a power conservative pre-condenser optics train, an annular diaphragm, a cardioid...http://www.google.fr/patents/US7551349?utm_source=gb-gplus-shareBrevet US7551349 - High resolution optical microscope with cardioid condenser for brightfield and darkfield illumination
High resolution optical microscope with cardioid condenser for brightfield ...
