因為我有一顆 Schneider 的老鏡,很好奇它的年紀有多大了。所以上網找了一下資料。

Serial Number
Date
30,000December 1919
40,000May 1920
50,000January 1922
100,000January 1925
200,000June 1928
300,000February 1929

Serial Number
Date
400,000April 1931
500,000June 1932
600,000August 1933
700,000October 1934
800,000September 1935
900,000May 1936
1,000,000November 1936
1,200,000December 1937
1,400,000November 1938
1,600,000September 1939
1,800,000June 1942
2,000,000September 1948
2,200,000July 1949
2,400,000October 1950
2,600,000May 1951
2,800,000November 1951
3,000,000May 1952
4,000,000October 1954
5,000,000February 1957
6,000,000May 1959
7,000,000February 1961
8,000,000March 1963
8,500,000February 1964
9,000,000February 1965
9,500,000September 1965
10,000,000January 1967
10,500,000October 1967
11,000,000November 1968
11,500,000July 1970
12,000,000September 15, 1972
12,500,000March 1974
13,000,000December 1976
13,200,000September 1977
13,400,000Ocotober 1978
13,600,000October 1979
13,800,000January 1981
14,000,000October 1983
14,100,000January 1985
14,200,000August 1986
14,300,000November 1988
14,400,000January 1991
14,460,000February 1992
14,480,000January 1993
14,500,000November 1993
14,510,000January 1994
14,520,000May 1994
14,540,000January 1995
14,560,000April 1995
14,590,000January 1996
14,600,000April 1996
14,620,000November 1996
14,730,000April 2000


資料來源:
http://www.schneideroptics.com/info/age_of_lenses/index.htm