Metabones MFT to EF Speed booster ULTRA CINE (0,71x) works with many MFT-cameras (please check compatibility). Works with Black Magic Pocket 4K (crop factor 1.35) & Pocket HD. Makes lenses 0.71x wider. Increases maximum aperture by 1 stop.
This ULTRA version uses an advanced 5-element 4-group optical design incorporating ultra-high index tantalum-based optical glass. The CINE version has a positive-lock EF lens mount.