# Build dates of Canon lenses **URL:** \ **Category:** Shift518 Automotive\ **Created:** [April 6, 2010, 5:57pm UTC](https://forums.speedlife.net/t/build-dates-of-canon-lenses/251321 "2010-04-06T17:57:17Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Cossey](https://avatars.discourse-cdn.com/v4/letter/c/3ec8ea/32.png) [@Cossey](https://forums.speedlife.net/u/Cossey)\ **Post date:** [April 6, 2010, 5:57pm UTC](https://forums.speedlife.net/t/build-dates-of-canon-lenses/251321/1 "2010-04-06T17:57:17Z")
> Canon Lens Aging - How Old Is That Lens? > > Canon Lens Date Code > > ![http://www.the-digital-picture.com/Images/Other/Lens-Date-Code.jpg](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/3X/3/9/39ca9a5475e68f55a7717d7b2578fc3571f0b509.jpeg) > > Beside the rear lens element of many (but not all) Canon lenses is a date code (as seen above) in the form of “UR0902”. This code is also present on many other Canon products including camera bodies. > > The first letter, “U”, indicates that the lens was made in Canon’s Utsunomiya, Japan factory. Prior to 1986, this letter is moved to the last position of the date code. > > U = Utsunomiya, Japan > F = Fukushima, Japan > O = Oita, Japan > > The second letter, “R”, is a year code that indicates the year of manufacture. Canon increments this letter each year starting with A in 1986 and prior to that, A in 1960 without the leading factory code. Here is a table to make things simple: > > A = 1986, 1960 > B = 1987, 1961 > C = 1988, 1962 > D = 1989, 1963 > E = 1990, 1964 > F = 1991, 1965 > G = 1992, 1966 > H = 1993, 1967 > I = 1994, 1968 > J = 1995, 1969 > K = 1996, 1970 > L = 1997, 1971 > M = 1998, 1972 > N = 1999, 1973 > O = 2000, 1974 > P = 2001, 1975 > Q = 2002, 1976 > R = 2003, 1977 > S = 2004, 1978 > T = 2005, 1979 > U = 2006, 1980 > V = 2007, 1981 > W = 2008, 1982 > X = 2009, 1983 > Y = 2010, 1984 > Z = 2011, 1985 > > - assumption of continuation being made for future years. > > The first two numbers, “09”, is the month number the lens was manufactured in. Month 02 is February, month 11 = November. The leading zero of the month code is sometimes omitted. > > The next two numbers, “02”, are meaningless in determining how old a Canon lens is. This is a Canon internal code (that is occasionally omitted). > > You now know the manufacture date for your lens - But - You cannot know how long the lens was in inventory, in shipping transit and on a shelf until it was originally purchased (without having the original receipt or a reputable person accurately informing you). > > The Canon lens date code in the sample picture indicates that this Canon EF 24-70mm f/2.8 L Lens (I know because I took the picture - not from the date code) was made in Utsunomiya, Japan in September 2003. Source: [Determining the Age of a Canon Lens Using Serial Numbers and Date Codes](http://www.the-digital-picture.com/Canon-Lenses/Canon-Lens-Aging.aspx) This information is very helpful if you plan on buying a used lens, or even a new lens from a not-so-popular company where the lens could have been sitting on the shelf for a while. ---
**Author:** ![elmalouno](https://avatars.discourse-cdn.com/v4/letter/e/848f3c/32.png) [@elmalouno](https://forums.speedlife.net/u/elmalouno)\ **Post date:** [April 7, 2010, 5:54pm UTC](https://forums.speedlife.net/t/build-dates-of-canon-lenses/251321/2 "2010-04-07T17:54:14Z")
do lenses go bad or something? ---
**Author:** ![Mk4\_30R\_Ban](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mk4_30r_ban/32/6347_2.png) [@Mk4\_30R\_Ban](https://forums.speedlife.net/u/Mk4_30R_Ban)\ **Post date:** [April 7, 2010, 6:22pm UTC](https://forums.speedlife.net/t/build-dates-of-canon-lenses/251321/3 "2010-04-07T18:22:11Z")
if they are mis handled surely. but its nice to know when it was manufactured. ---
**Author:** ![Cossey](https://avatars.discourse-cdn.com/v4/letter/c/3ec8ea/32.png) [@Cossey](https://forums.speedlife.net/u/Cossey)\ **Post date:** [April 7, 2010, 8:13pm UTC](https://forums.speedlife.net/t/build-dates-of-canon-lenses/251321/4 "2010-04-07T20:13:19Z")
> [@canada is pathetic](https://forums.speedlife.net/t/canada-is-pathetic/30791/4): > > do lenses go bad or something? I believe they MIGHT need to be refreshed after a certain amount of shots. Consider the autofocus… It’s like a motor that moves some things around until you see it clearly. It is also very helpful when buying items on second hand at dealer shops or over eBay. Last but not least this is a good way of telling if the lens came out on a period that people complain about focus issues and Canon replace them for new ones. Similar to say, a certain car year that sucked for the model or even the whole manufacturer.