There is still an issue with gh5, metabones speedbooster ef ultra and zoom lenses (like my Sigma 18-35). When You zoom in, the camera freezes. Is there a way to contact someone from Pansonic to ask if there would be a firmware update and if yes when? I contacted both Panasonic and Metabones, but they didn't reply. A lot of folks are using adapters with m43 cameras so it is a big issue for us, with this otherwise great camera.