https://community.usa.canon.com/t5/EF-RF-Lenses/60d-lens-w-TC/m-p/9683#M18697 Yep don't expect it to work unless you can live with MF only. As cicopo points out, once your minimum F stop drops to f/8 or smaller, you've lost AF functionality on the 60D. Check your lens manual (PDF download), it clarifies this. Wed, 02 Jan 2013 14:08:29 GMT 7D5D 2013-01-02T14:08:29Z https://community.usa.canon.com/t5/EF-RF-Lenses/60d-lens-w-TC/m-p/9667#M18695 <P>Does AF work wile using a 100-400 zoom and a 1.4 TC on a 60d?</P><P>&nbsp;</P><P>Thanks for your help!</P> Wed, 02 Jan 2013 04:25:22 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/60d-lens-w-TC/m-p/9667#M18695 ssmith 2013-01-02T04:25:22Z https://community.usa.canon.com/t5/EF-RF-Lenses/60d-lens-w-TC/m-p/9677#M18696 <P>I'm pretty sure it doesn't. If it will it would be with only the center AF point active, but from everything I've read only the 1 series bodies focus at f8.0.</P> Wed, 02 Jan 2013 13:05:10 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/60d-lens-w-TC/m-p/9677#M18696 cicopo 2013-01-02T13:05:10Z https://community.usa.canon.com/t5/EF-RF-Lenses/60d-lens-w-TC/m-p/9683#M18697 Yep don't expect it to work unless you can live with MF only. As cicopo points out, once your minimum F stop drops to f/8 or smaller, you've lost AF functionality on the 60D. Check your lens manual (PDF download), it clarifies this. Wed, 02 Jan 2013 14:08:29 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/60d-lens-w-TC/m-p/9683#M18697 7D5D 2013-01-02T14:08:29Z