https://community.usa.canon.com/t5/EF-RF-Lenses/Canon-EF-L-USM-28-70mm-F-2-8-Len/m-p/14361#M20820 <P>How do I tell when was the Canon EF L USM 28-70mm F/2.8 Len, serial # #44181 made.</P> Tue, 12 Feb 2013 04:26:55 GMT canon7d 2013-02-12T04:26:55Z https://community.usa.canon.com/t5/EF-RF-Lenses/Canon-EF-L-USM-28-70mm-F-2-8-Len/m-p/14361#M20820 <P>How do I tell when was the Canon EF L USM 28-70mm F/2.8 Len, serial # #44181 made.</P> Tue, 12 Feb 2013 04:26:55 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/Canon-EF-L-USM-28-70mm-F-2-8-Len/m-p/14361#M20820 canon7d 2013-02-12T04:26:55Z https://community.usa.canon.com/t5/EF-RF-Lenses/Canon-EF-L-USM-28-70mm-F-2-8-Len/m-p/14389#M20821 <BLOCKQUOTE><HR /><a href="https://community.usa.canon.com/t5/user/viewprofilepage/user-id/8543">@canon7d</a> wrote:<BR /><P>How do I tell when was the Canon EF L USM 28-70mm F/2.8 Len, serial # #44181 made.</P><HR /></BLOCKQUOTE><P>Does the lens have a date code? It is two letters followed by four numbers. They're usually inside the metal mount on the black rearward surface.</P><P>&nbsp;</P><P>I believe that lens was manufactured between 1993 and 2002 so the second letter of the date code would be from H through Q indicating which year it was made. The first two numbers are the month.</P> Tue, 12 Feb 2013 17:18:41 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/Canon-EF-L-USM-28-70mm-F-2-8-Len/m-p/14389#M20821 trulandphoto 2013-02-12T17:18:41Z