Thread Mount Lenses x Ordinal

adapted from Stephen Gandy's and ( Issei Yoshida's ) [1] lists

• 01 - 50mm f/3.5 Elmar Era - 1931-1959 or (1924-1959 Issei Yoshida) Collapsible
• 02 - 35mm f/3.5 Elmar Era - 1930-1950
• 03 - 50mm f/2.5 Hektor Era - 1931-1948 Collapsible
• 04 - 90mm f/4 Elmar Era - 1931-1963
• 05 - 135mm f/4.5 Elmar Era - 1931-1936
• 06 - 135mm f/4.5 Hektor Era - 1933-1960
• 07 - 73mm f/1.9 Hektor Era - 1931-1946 or (1935-1949 Issei Yoshida}
• 08 - 105mm f/6.3 Elmar Era - 1932-1937
• 09 - 50mm f/2 Summar Era - 1933-1940
• 10 - 90mm f/2.2 Thambar Era - 1935-1949
• 11 - 28mm f/6.3 Hektor Era - 1935-1955
• 12 - 50mm f/1.5 Xenon Era - 1936-1950
• 13 - 50mm f/2 Summitar Era - 1939-1955
• 14 - 85mm f/1.5 Summarex Era - 1943-1960
• 15 - 35mm f/3.5 Summaron Era - 1949-1960 or {1946-1960 Issei Yoshida}
• 16 - 50mm f/1.5 Summarit Era - 1949-1960
• 17 - 50mm f/2 Summicron Era - 1953-1960 Collapsible
• 18 - 125mm f/2.5 Hektor Era - 1954-1963
• 19 - 50mm f/2.8 Elmar Era - 1957-1962 Collapsible
• 20 - 28mm f/5.6 Summaron Era - 1955-1963
• 21 - 90mm f/2 Summicron Era - 1957-1962 very rare
• 22 - 35mm f/2 Summicron Era - 1958-1962 or {1963 Issei Yoshida)
• (23 - 90mm f/2.8 Elmarit Era - 1959-1963 Issei Yoshida)
• 24 - 50mm f/1.4 Summilux Era - 1960-1963 Issei Yoshida}
• 25 - 50mm f/2 Summicron Era - 1960-1963
• 26 - 50mm f/2 Summicron Era - August 1999-
• 27 - 50mm f/1.4 Summilux Era - August 1999-
• 28 - 35mm f/2 Summicron ASPH Era - August 1999-