Metabones T CINE Speed Booster XL 0.64x Adapter MBSPEF-M43-BTB
Metabones T CINE Speed Booster XL 0.64x Adapter, Canon EF Lens to BMPCC4K Camera MB_SPEF-M43-BTB
Viltrox Ef-m2ii Speed Booster Adapter Focal Reducer Auto-focus 0.71x For Canon Ef Mount Lens To Panasonic Olympus M43 Camera - Lens Adapter - AliExpress
Viltrox EF-R3 0.71x Speed Booster Full Frame Lens Adapter for Canon EOS EF to R | eBay
Canon has released a 0.71x EF to RF speed booster adapter - DIY Photography
Viltrox EF-E II Speed Booster Lens Adapter for Canon EOS EF to Sony A9 A7 A7RII | eBay
Midwest Photo Metabones Canon EF Lens to Sony E-mount T CINE Speed Booster ULTRA 0.71x Adapter
Metabones T Speed Booster ULTRA II 0.71x (Fifth Generation) - Canon EF to Sony E-Mount Adapter | Lens / Mount Adapters | Lenses / Accessories | Buy | AbelCine
VILTROX EF-M2 II Focal Reducer Speed Booster Adapterfor Canon EF Mount – Viltrox Store
Viltrox EF-R3 0.71 Speed Booster Adapter for Canon EF to Canon RF-Moun – Rent in NYC at The Imaging World Camera Rentals in Brooklyn