Video of using an sony a9 on canon glass...
"Sony A9 MC-11 MBIV Canon EF Long Glass Compatibility for Sports Photography"
https://www.youtube.com/watch?v=6DEMEyubGdw
"Sony A9 MC-11 MBIV Canon EF Long Glass Compatibility for Sports Photography"
https://www.youtube.com/watch?v=6DEMEyubGdw