No, you're doing it right. I have several C/Y Zeiss lenses that I use with my R5 and R6 via a "dumb" adapter (mine is by Urth). As others have said, you won't get a focus point, because there are no electrical connections in the adapter. I've been using adapters like these for years with micro four thirds cameras and a Sony a7R, and the best way I've found to focus is to use the magnifier. The R5 and R6 allow you to cycle through three levels of magnification using the magnifier button on the back of the camera. The viewfinders on the R5 and R6 make proper focus easy to judge. With no magnification, you won't see any white boxes or guides in the viewfinder. With the first press of the magnifier button, you will see "X6" in the lower right corner of the viewfinder along with a white rectangle. Inside the rectangle is a smaller, solid white rectangle. The larger rectangle represents the whole image while the small rectangle represents the area being magnified in relation to the full image. Another press of the magnifier button takes you to "X15" magnification and the small rectangle becomes smaller still to indicate a smaller area being magnified. You can use the joystick to move the magnified area around and you will see the small rectangle move accordingly within the larger white rectangle to indicate where you are within the frame. I apologize if this is as clear as mud, but I hope it helps.
I fully understood, thanks JM Thats what I discovered, magnify and use the joy stick to move to different area's to obtain focus for that area. (Really not the best way to use manual focus lenses.)
Sony is more user friendly using legacy glass, you will get a focus point that you can move around and focus in on.
I highly doubt Canon will address this short coming for manual only focused lenses.. We just have to make the best of what we have using legacy glass.






