https://community.usa.canon.com/t5/EF-RF-Lenses/looking-for-an-extender-that-is-compatible-with-my-Can-EF75/m-p/21725#M21061 You can not use the Canon extenders at all as they will not fit Thu, 25 Apr 2013 02:50:49 GMT jGordon24 2013-04-25T02:50:49Z https://community.usa.canon.com/t5/EF-RF-Lenses/looking-for-an-extender-that-is-compatible-with-my-Can-EF75/m-p/20423#M21059 <P>I have a Canon 5d mii camera and had purchased a Canon EF lens : 75-300mm : 4-5.6 IS USM many years ago for a Canon t90 and would like to get an extender (tc) for the DSLR and lens. I have looked at the compatibility charts for the Canon 2x and 1.4 tc but I do not see this particular lens listed. Can anyone suggest where to find out whether or not I can purchase a tc for this lens or not.. Thanks much ~mmstar</P> Fri, 12 Apr 2013 17:14:52 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/looking-for-an-extender-that-is-compatible-with-my-Can-EF75/m-p/20423#M21059 MMStar 2013-04-12T17:14:52Z https://community.usa.canon.com/t5/EF-RF-Lenses/looking-for-an-extender-that-is-compatible-with-my-Can-EF75/m-p/20455#M21060 <P>This is the link to the most informative info I've seen</P><P>&nbsp;</P><P><A href="http://photography-on-the.net/forum/showthread.php?t=41922" target="_blank">http://photography-on-the.net/forum/showthread.php?t=41922</A></P><P>&nbsp;</P><P>I don't think that lens can be used with a TC but even if it can it's going to kill your AF performance.</P><P>&nbsp;</P> Fri, 12 Apr 2013 22:42:44 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/looking-for-an-extender-that-is-compatible-with-my-Can-EF75/m-p/20455#M21060 cicopo 2013-04-12T22:42:44Z https://community.usa.canon.com/t5/EF-RF-Lenses/looking-for-an-extender-that-is-compatible-with-my-Can-EF75/m-p/21725#M21061 You can not use the Canon extenders at all as they will not fit Thu, 25 Apr 2013 02:50:49 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/looking-for-an-extender-that-is-compatible-with-my-Can-EF75/m-p/21725#M21061 jGordon24 2013-04-25T02:50:49Z https://community.usa.canon.com/t5/EF-RF-Lenses/looking-for-an-extender-that-is-compatible-with-my-Can-EF75/m-p/21801#M21062 like Jgordon24 said, you cannot use Canon TC. But you can use third party one like ProOptics or Kenko. But your camera AF may not working. Thu, 25 Apr 2013 18:59:53 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/looking-for-an-extender-that-is-compatible-with-my-Can-EF75/m-p/21801#M21062 hsbn 2013-04-25T18:59:53Z https://community.usa.canon.com/t5/EF-RF-Lenses/looking-for-an-extender-that-is-compatible-with-my-Can-EF75/m-p/21915#M21063 <P>Forget it. Don't do it. It is a bad idea.</P> Fri, 26 Apr 2013 15:26:53 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/looking-for-an-extender-that-is-compatible-with-my-Can-EF75/m-p/21915#M21063 ebiggs1 2013-04-26T15:26:53Z