A Kouranon S 6-element enlarging lens (they came in both 50mm & 75mm). I have loads of top brand enlarging lenses gathered over many yrs, incl. a Leitz Focotar 2 & Leitz Focotar "big element" made by Scheinder, But only the Komura gives the subject a freshly minted, "Dawn of Tme' look. Chip