Beck Symmetrical lens. F: 11" iris diaphragm f8-64. Beck symmetrical lens Photographic Technology 1900-1910
Beck rapid rectilinear type c.F10 inch f/8-45 in flange. Beck symmetrical lens Photographic Technology
Bausch and Lomb Rapid Symmertrical lens Series II. F7 1/2", iris diaphragm f8-64. In Unicum shutter 1/2/5/25/50/100/B/T. With mounting flange. Bausch and Lomb rapid symmetrical lens Photographic Technology
