Carl Zeiss, Optische Werkstätte, Jena

Carl Zeiss, Optische Werkstätte, Jena (Carl Zeiss Optical Works, Jena) was the first name used by the Carl Zeiss firm. In 1904, the company changed its name to Carl Zeiss, Jena.

Instruments made by the firm are signed "Zeiss" or "Carl Zeiss" in cursive lettering or "Carl Zeiss Optische Werkstätte Jena."