A = 1986, 1961
B = 1987, 1962
C = 1988, 1963
D = 1989, 1964
E = 1990, 1965
F = 1991, 1966
G = 1992, 1967
H = 1993, 1968
I = 1994, 1969
J = 1995, 1970
K = 1996, 1971
L = 1997, 1972
M = 1998, 1973
N = 1999, 1974
O = 2000, 1975
P = 2001, 1976
Q = 2002, 1977
R = 2003, 1978
S = 2004, 1979
T = 2005, 1980
U = 2006, 1981
V = 2007, 1982
W = 2008, 1983
X = 2009, 1984
Y = 2010, 1985
Z = 2011, 1986
通常 L 鏡或定焦鏡才會有此編號，
回覆刪除ex: UW8*****
那個 W 代表 2008 年出產的鏡頭。