K&F M10121 M42 Lenses to M43 MFT Lens Mount Adapter
This adaptor is a great fit on my GH5 for my Helios 44-M. No light leaks, easy to fit, doesn’t come loose when changing the lens. You do have to adjust the ibis (double the focal length, I use 116, so it’s a definite portrait lens) but it gives a new lease of life to a lovely lens. Everything works fine. Well worth it and gives you a great vintage lens in your kit.