https://community.usa.canon.com/t5/Speedlite-Flashes/Can-t-get-my-600Ex-Rt-to-sync-with-my-6D-help/m-p/41291#M1786 <P>I think you also posted in the EOS forum and I responded there.</P><P>&nbsp;</P><P>The 6D does not have a built-in radio or optical controller. &nbsp;It does have the on-camera menus to control the flash provided it's in the hot-shoe OR that you have either a speedlight controller or a 2nd speedlight with a built-in controller.</P><P>&nbsp;</P><P>You'd want to either get a 2nd 600EX-RT (which is what I did) or you can get an ST-E3-RT (which has the same buttons, LCD, and menu as the speedlight... but without the light and it's an on-camera radio controller to talk to off-camera radio flashes.)</P><P>&nbsp;</P> Wed, 25 Sep 2013 01:00:27 GMT TCampbell 2013-09-25T01:00:27Z https://community.usa.canon.com/t5/Speedlite-Flashes/Can-t-get-my-600Ex-Rt-to-sync-with-my-6D-help/m-p/41261#M1785 <P>Just purchased my 600ex-rt and love it, but I can't seem to sync it with my 6D as a stand-alone slave. My camera options under <STRONG>[External Speedlite Control]</STRONG> called <STRONG>[Flash function settings]</STRONG> or <STRONG>[Flash C.Fn settings]</STRONG> keeps saying <EM>"This menu cannot be displayed. Incompatible flash or flash's power is turned off." </EM>My camera WiFi is turned on. I have the flash on ETTL (slave) mode. They both are displaying the entanna as on, but when I fire off my camera the flash doesn't fire off. Anyone help me here?</P> Wed, 25 Sep 2013 00:28:55 GMT https://community.usa.canon.com/t5/Speedlite-Flashes/Can-t-get-my-600Ex-Rt-to-sync-with-my-6D-help/m-p/41261#M1785 dbseeker 2013-09-25T00:28:55Z https://community.usa.canon.com/t5/Speedlite-Flashes/Can-t-get-my-600Ex-Rt-to-sync-with-my-6D-help/m-p/41291#M1786 <P>I think you also posted in the EOS forum and I responded there.</P><P>&nbsp;</P><P>The 6D does not have a built-in radio or optical controller. &nbsp;It does have the on-camera menus to control the flash provided it's in the hot-shoe OR that you have either a speedlight controller or a 2nd speedlight with a built-in controller.</P><P>&nbsp;</P><P>You'd want to either get a 2nd 600EX-RT (which is what I did) or you can get an ST-E3-RT (which has the same buttons, LCD, and menu as the speedlight... but without the light and it's an on-camera radio controller to talk to off-camera radio flashes.)</P><P>&nbsp;</P> Wed, 25 Sep 2013 01:00:27 GMT https://community.usa.canon.com/t5/Speedlite-Flashes/Can-t-get-my-600Ex-Rt-to-sync-with-my-6D-help/m-p/41291#M1786 TCampbell 2013-09-25T01:00:27Z https://community.usa.canon.com/t5/Speedlite-Flashes/Can-t-get-my-600Ex-Rt-to-sync-with-my-6D-help/m-p/42011#M1787 <P>Thank you I did get the information just as you've described. Thanks a million!</P> Mon, 30 Sep 2013 07:04:32 GMT https://community.usa.canon.com/t5/Speedlite-Flashes/Can-t-get-my-600Ex-Rt-to-sync-with-my-6D-help/m-p/42011#M1787 dbseeker 2013-09-30T07:04:32Z