![]() ![]() If at the beginning, the first letter is the plant, the second is the year. The factory code comes at the beginning or end of the code. “O” stand for Oita and “U stands for Utsonomiya, all cities where the respective plants are located. However, you will often find another alphabetical letter preceding or appended to the date code and this stands for the factory where the lens or camera was produced. ![]() If you know the dates of manufacture from the Canon Museum website you can pinpoint what you have.Ĭanon has not, apparently, said what the final two numbers were for. This dating can be really helpful when you have two lenses that look identical and you want to tell them apart. So this lens was manufactured in July of 1971. Month of manufacture is 7 or 7th month, i.e. The numerals are three digits so we know the leading zero has been dropped. The letter L signifies manufacture in 1971. We know the FD lenses were manufactured in the 1970’s so we are looking at first series in the table. So, for the lens above lets see how this works. ![]()
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