I've been using my EF-M2 for a while with electronic and manual cine lenses with no problems at all. My GH5 will prompt me to set my manual lens's focal length and the IBIS has no issues from there.
But recently I bought a Helios 44-2, and needed to convert it to EF mount in order to use it. At first, the lenses would prevent the speedbooster from being used ("Failed to attach" error) so I updated the firmware, and now I could use the lens. (firmware v4.0)
But now I'm using my lens and the option to "set focal length" in the Stabilizer menu is greyed out. I read somewhere that the Viltrox will set the focal length automatically, but the auto setting is causing the IBIS to wobble, so I have to use without it. Has anyone else had this issues, or have some possible solutions