Zeiss Opton Biogon 4.5/21mm Cutaway, 1952

Zeiss Opton Biogon 4.5/21mm wide-angle lens Cutaway, 1952

Original factory-made cutaway model of the Zeiss-Opton Biogon 4.5/21mm for Contax (prototype no.5 of the Biogon 21mm). Cutaway models of Contax lenses are a sought after rarity - not to speak of a prototype model!

Photo credit: © WestLicht Photographica Auction