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How to Determine the Age of Your Lens Using Canon’s New 10-Digit Serials

Canon has been putting a date code on its lenses since the 1960's, but ever since 2008 the company has been transitioning to a 10-digit serial system, sans date code. At first this caused quite a stir, as many a conspiracy theory began popping up; but not to worry, the code is there, it's just been incorporated into the new 10-digit system.