fits perfectly (no wobbling, etc.) - extremely stable - the original just no way around

After plenty of thought, I have yet decided on an original Canon product and am glad not to a comparable product name None - to have recourse - even though these are sometimes significantly cheaper. Everything fits superbly fits perfectly, does not wobble and is stable. In particular, the filters from different manufacturers fit exactly. And even without a filter, the adapter is in fact a good protection of the lens.
Finally, does the camera (in my case the G 12) a bit high. Hence my absolute buy recommendation.