When Canon announced the EOS R5 and EOS R6, introducing, finally, IBIS on its cameras. AND causing a very big amount of confusion on how optical Image Stabilization from EF lenses with In-Body Image Stabilization are working together or not. By Google it and we fall into a rabbit hole of forums with no clear answer, and Facebook groups don’t help that much… Do EF lenses with IS work with IBIS? Well, it depends. Not if it will work or not, IT WILL.
This bord helps to explain: