Patent ID: 7586675

Claim:
A surgical stereomicroscope having a pair of beam paths, the surgical stereomicroscope comprising: at least one main objective for imaging an object observed by the stereomicroscope; and at least one optical element increasing a depth of field of the surgical stereomicroscope while the at least one optical element is stationary, the at least one optical element including at least a first region having a first focal length and a second region having a second focal length which differs from the first focal length, the first region focusing a light beam into a first focal point and providing a first field depth range, and the second region simultaneously focusing a light beam into a second focal point and providing a second field depth range, wherein the first field depth range and the second field depth range adjoin to overlap one another to form a continuous total field depth range, and wherein the at least one optical element includes a pair of optical elements positioned one in each of the pair of beam paths of the stereomicroscope.