Review on 💥 Enhance Your Canon EF Lens Performance with VILTROX EF-M2 Speed Booster Adapter - Auto Focus, 0.71x, M43 Camera Compatibility, USB Update Port by Richard Ahmar

Mounted on Olympus em1mk2 lenses with PenF mount - ef It seems that all units suffer from a lack of quality control. Mine works fine and allows all features, but with mf Zeiss lenses the aperture value doesn't convert properly. The hole doesn't line up exactly, which is a bit of a concern, but as it's rarely used I hope it's ok unless they're specialty lenses. Not recommended if EF lenses need to be mounted frequently. Cheaper than Metabons, but also lower quality