I have been using this lens and adapter ( canon) With the R7 for over a year. Great kit. You need a decent strap to support this kit.. One that supports most of the lens weight, Not the camera body. The canon adapter has a bit of movement. on the R7 and R5. This will cause an error messd to pop up. The RF 100-500 is a better-balanced lens and no adapter. needed. You can find them used for a decrnt price.