In fact, in 1890 Paul Rudolph designed the Zeiss Anastigmat with two cemented doublets, then in 1899 he took apart the doublets in the Zeiss Anastigmat to produce the four element, four group Unar lens.
Paul Rudolph designed the Zeiss Anastigmat with two cemented doublets. This was in 1890. This was in fact. He took apart the doublets in the Zeiss Anastigmat. This was in 1899. This was in fact. This was to produce the four element. The four element was four group Unar lens.