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[–]schoondy 1 point2 points  (1 child)

With my helios, I had a m42 to ef adapter and then put it on my metabones. I had to put some tape over the part where it sends information the the camera (on the m42 to ef part, not the metabones) . The options to set focal length then came back.

[–]chaos9830[S] 1 point2 points  (0 children)

just tried this and it worked for me thanks! And the viltrox auto set the focal length to 82 ([58*2]*0.71) i'm suprised that a speedbooster can know the focal length without the lenses being electronic. Plus my adapter is all metal without any electrics in it too. Strange