Patent ID: 7394593

Claim:
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 ; 17 , 18 ) 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, wherein the light source is embodied as a reflector lamp ( 3 ); and arranged next to the light exit side of the reflector lamp ( 3 ) is a continuously controllable mechanical brightness regulator ( 4 ) having an associated adjustment device ( 41 ) by way of which the brightness regulator ( 4 ) is activatable in such a way that the illumination intensity of the transmitted-light base ( 1 ) is controllable with no change in the spectral intensity distribution.