Elmarit-R 2,8/35mm Version I & II
This lens was part of the original set of four lenses, specifically designed for the first Leicaflex. The 35mm lens has 7 elements in 5 groups. The thick middle group is typical of this design. Later version (second version) had all metal mounts and a small change in optical prescription with a tiny airspace between the second and third elements (previously cemented).