https://community.usa.canon.com/t5/EF-RF-Lenses/Repair-and-parts-availability-for-the-version-1-big-guns/m-p/10855#M18678 <P>Ronr2,<BR /><BR />All of the lenses you mention are no longer able to be repaired except for the EF 500 F/4L IS USM lens. The others are all out of service life.</P><P>&nbsp;</P><P>We do not have a public database&nbsp;which details how long parts in inventory will be available.&nbsp; We apologize for any inconvenience that this may cause you.&nbsp;&nbsp;</P> Thu, 10 Jan 2013 01:31:44 GMT Tim 2013-01-10T01:31:44Z https://community.usa.canon.com/t5/EF-RF-Lenses/Repair-and-parts-availability-for-the-version-1-big-guns/m-p/9503#M18677 <P>How long will Canon maintain a parts inventory and will have repair capability for the 300mm 2.8, 400mm 2.8, 500mm f4 and 600mm f4.</P> Mon, 31 Dec 2012 15:08:30 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/Repair-and-parts-availability-for-the-version-1-big-guns/m-p/9503#M18677 Ronr2 2012-12-31T15:08:30Z https://community.usa.canon.com/t5/EF-RF-Lenses/Repair-and-parts-availability-for-the-version-1-big-guns/m-p/10855#M18678 <P>Ronr2,<BR /><BR />All of the lenses you mention are no longer able to be repaired except for the EF 500 F/4L IS USM lens. The others are all out of service life.</P><P>&nbsp;</P><P>We do not have a public database&nbsp;which details how long parts in inventory will be available.&nbsp; We apologize for any inconvenience that this may cause you.&nbsp;&nbsp;</P> Thu, 10 Jan 2013 01:31:44 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/Repair-and-parts-availability-for-the-version-1-big-guns/m-p/10855#M18678 Tim 2013-01-10T01:31:44Z