Studio Camera 4K not compatible with Canon EF mount?

Hello everyone
I just bought a Blackmagic Studio Camera 4K Plus G2. The Blackmagic website says it is compatible with lenses that have the Canon EF mount, so I bought two lenses with EF mount for it:
Canon EF 16-35mm f/4L IS USM
Canon EF 24-105mm f/4 L IS II USM
But when I tried to mount them on the camera, they were not compatible. The mount on the lense was much bigger than the one on the camera.
Do I need an adapter for it? Or is it simply not true, what the website says? Or are there different kinds of EF mount that I am not aware of?
I just bought a Blackmagic Studio Camera 4K Plus G2. The Blackmagic website says it is compatible with lenses that have the Canon EF mount, so I bought two lenses with EF mount for it:
Canon EF 16-35mm f/4L IS USM
Canon EF 24-105mm f/4 L IS II USM
But when I tried to mount them on the camera, they were not compatible. The mount on the lense was much bigger than the one on the camera.
Do I need an adapter for it? Or is it simply not true, what the website says? Or are there different kinds of EF mount that I am not aware of?