title: A new zoom illumination system for constant image brightness at all magnification in the surgical operating microscope.
abstract: The article describes a new illumination system for operating microscopes. An optical zoom system keeps the image brightness constant at all magnifications. For the surgeon the visual acuity remains the same whatever the enlargement of the image.
mesh_terms: D008853:Microscopy / Q000295:instrumentation*; D008866:Microsurgery / Q000295:instrumentation*