EOS R5 C autofocus not working in video mode on EF lenses

[aanbari]

Hello,

I just bought the R5c.  I own a number of EF lenses.  All my EF lenses autofocus fine on the Photo mode of the R5C but none of them autofocus in video mode.

This includes 

- Canon 16-35 f2.8 III

- Canon 24-70 f4 II

- Canon 70-200 f2.8 III

- Sigma Contemporary 150-600

I have upgraded the firmware to the latest on camera.

Is there anything I can do?  Please help.

thanks,

Ammar

[Stephen]

Hello!

Which lens mount adapter are you using?

[aanbari]

The canon Rf to EF pass through adapter 

[Waddizzle]

What AF points, video modes, and AF tracking modes are you using?  

What are your subjects doing?  Moving or still?  How far away?  How can I reproduce your issue?