Abstract: The invention relates to a transmitted-light base (1) for illuminating an object (15) for imaging through a zoom microscope (21), the transmitted-light base (1) comprising an integrated light source (3) having an associated electrical power regulation system (31) for generating a suitable radiation flux, and means (5, 6), capable of being added downstream, for generating a specified spectral intensity distribution. To allow compensation for brightness changes of low dynamic range, such as those occurring in particular during zooming, a continuously controllable mechanical brightness regulator (4) is proposed which is activatable by means of an associated adjustment device (41) in such a way that the illumination intensity of the transmitted-light base (1) is controllable with no change in the spectral intensity distribution.

Abstract: The invention relates to a transmitted-light base (1) for illuminating an object (15) for imaging through a zoom microscope (21), the transmitted-light base (1) comprising an integrated light source (3) having an associated electrical power regulation system (31) for generating a suitable radiation flux, and means (5, 6), capable of being added downstream, for generating a specified spectral intensity distribution. To allow compensation for brightness changes of low dynamic range, such as those occurring in particular during zooming, a continuously controllable mechanical brightness regulator (4) is proposed which is activatable by means of an associated adjustment device (41) in such a way that the illumination intensity of the transmitted-light base (1) is controllable with no change in the spectral intensity distribution.

Abstract: An apparatus for fixing a microscope holder on a carrier includes both a clamping device for holding the microscope holder in a selected position relative to the carrier, and a locking device for securing the microscope holder to the carrier especially while the clamping device is released during positioning of the microscope holder relative to the carrier. Accordingly, accidental dropping of the microscope holder or disconnection of the microscope holder from the carrier is prevented.

Abstract: A zero-clearance, axially displaceable aligning mount system for optical components includes an unthreaded mount receptacle having a transverse orifice and includes an aligning mount carrying lens elements or lens combinations. A cured plastic casting compound forms a thread substitute in the region of the transverse orifice and beyond it. Coating of this region with an antiadhesion agent, prior to application of the casting compound in pasty form, prevents the molded threads from sticking.

Abstract: A zero-clearance, axially displaceable aligning mount system for optical components includes an unthreaded mount receptacle having a transverse orifice and includes an aligning mount carrying lens elements or lens combinations. A cured plastic casting compound forms a thread substitute in the region of the transverse orifice and beyond it. Coating of this region with an antiadhesion agent, prior to application of the casting compound in pasty form, prevents the molded threads from sticking.

Abstract: A switchable illumination system for a surgical microscope in eye surgery, which is provided with a light source, a collector lens system, a radiant field stop, optical deflecting elements, further lenses and a main objective. The radiant field stop is projected via the deflecting elements and the further lenses through the main objective onto the patient's eye to be viewed in the object plane. In the illumination beam there is provided a switching mechanism whereby the lamp filament of the light source is projected via the optical deflecting elements and the main objective onto the patient's eye to be viewed in the object planes.

Abstract: A stand for supporting an apparatus includes a main frame; a linkage parallelogram connected to the main frame; a first supporting arm connected to the linkage parallelogram; an energy storing element connected to the linkage parallelogram at a plurality of places; and a device for displacing the center of gravity of the apparatus. The displacing device includes a second supporting arm having a first non-vertical axis (A--A). The second supporting arm is rotatably connected to the first supporting arm and is connected to the apparatus by a connection point having a second non-vertical axis which is perpendicular to the first non-vertical axis. The displacing device displaces the center of gravity of the apparatus into a point of intersection of the first non-vertical axis and the second non-vertical axis.