The Bausch & Lomb Zeiss Large Format Camera Lens Unicum Brass Pat. Jan 6 1891 is a vintage lens with a fixed/prime focal length, designed for large format photography. Crafted from brass and manufactured in the United States, this lens exudes quality and craftsmanship. The Bausch & Lomb brand ensures reliability and precision, making it a valuable addition to any vintage photography enthusiast's collection.