ZEISS SteREO Discovery.V12​

The zoom body is the core of stereo and zoom microscopes. When zooming, lenses have to be positioned precisely. eZoom replaces the mechanical curve with an electronic one. Stepping motors position the moveable lenses precisely and take the tolerances of the individual lenses into account. Capture visibly more details with a doubled precision, compared to a mechanical zoom body.​

_{Caption
Green: depth of field curve, within these parameters, images are in focus​
Red: typical defocus curve of a single zoom channel with mechanical zoom curve​
Blue: typical defocus curve of a single zoom channel with electronic zoom curve}