Zeiss S-Planar 2,8/100mm

Only about 169 Carl Zeiss 2,8/100mm OPTON S-Planar lenses were produced by Zeiss Oberkochen to highest possible technical and optical standards, in heavy brass mount, non-focusing barrel without aperture in uncommon 40mm screw mount, front element diameter: 37mm, rear element diameter: 27mm, total length: 90mm, covering 6x6cm film (medium format).