The efficiency with which the light flux is utilized in a microscope's optical system is determined by how well the exit numerical aperture and the linear field of the condenser are matched with the numerical aperture and linear field of the microscope lens. It is shown that using a variable-maonification system in the layout of a microscope illuminator makes it possible to increase the efficiency with which the light flux is utilized by a factor of more than a hundred. (c) 2006 Optical Society, of America.
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