A Métascope multi-view table stereoscope for viewing 45x107mm glass stereoviews by Unis France, one of the trademarks of Mattey from Paris.
Today, Zeiss lenses are known for their high optical quality. The company has a long history and at the beginning of the 20th century it also produced stereoscopes. I recently added a rare Carl Zeiss Jena stereoscope to my collection
Two Zeiss Ikon hand-held stereoscopes for the 45x107 and 6x13 formats. The magnifying lenses of these stereo viewers offer a wonderful viewing experience. These are the workhorses I use to view my stereoview collection.
The Ernemann Universal Stereoscope is a versatile folding stereo viewer for glass and paper stereoviews that supports different formats.
Taxiphote was the name of a series of multiple view stereoscopes based on slide trays. The device was developed by Jules Richard and the first patent dates from 1900. The first models were just called Stéréo Classeur, but soon the name Taxiphote was introduced. It was the most sophisticated stereoscope of its time.