The 2x auxiliary lens increases the magnification of a stereoscopic microscope, while reducing the working distance to 40.4mm and the field of view twofold compared to a conventional objective.
The magnification of stereoscopic microscopes is increased primarily due to the eyepieces. For observations, the auxiliary lens is used when the magnification achieved with eyepieces is not enough. When capturing with a digital camera, eyepieces do not participate in the optical design and, therefore, an auxiliary lens is used.