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-E II Auto Focus Booster Lens Adapter for Canon EF Lens to S – Viltrox Store
Amazon.com : VILTROX EF-M2II 0.71x Speed Booster, EF to Micro 4/3 Focal Reducer Booster Adapter Auto-Focus for GH6 GH5M2 BMPCC 4K GH4 GH5 G100 G95 G85 OM-1 EM-1 E-M1X E-M1 iii E-M5
Amazon.com : VILTROX EF-EOS M2 Speed Booster 0.71x Canon EF Lens to EF-M Mount Speedbooster for Canon m50 ii m6 ii m200 m50 m6 m5 : Electronics
Viltrox EF-E II Speed Booster Lens Adapter for Canon EOS EF to Sony A9 A7 A7RII | eBay
Viltrox EF-R3 0.71 Speed Booster Adapter for Canon EF-Mount Lens to Ca – JG Superstore
Focal Reducer Speed Booster Turbo Adapter For Canon Ef Eos Lens To Sony Nex E Mount Camera Nex-7 A7 A7s A7rii A6000 A6300 A6500 - Lens Adapter - AliExpress
ADAPTER vs SPEED BOOSTERS and Crop Factor EXPLAINED - YouTube
Viltrox EF-EOS M2 EF-M Lens Adapter 0.71x Speed Booster for Canon EF lens to EOS | eBay
Viltrox M43 Lens Adapter Focal Reducer Speed Booster Turbo Aperture 0.71x For Nikon Lens To M4/3 Camera Panasonic Olympus - Lens Adapter - AliExpress
Amazon.com : VILTROX EF-EOS M2 Speed Booster 0.71x Auto-Focus Canon EF Lens EF-M Speedbooster Compatible with Canon EF to m50 ii m6 ii m200 m50 m6 m5 : Electronics
Metabones Speed Booster adapter gives lenses an extra f/stop and nearly full frame focal lengths on APS-C sensors - Newsshooter
Metabones announces 'Speed Booster' lens adapter for mirrorless cameras: Digital Photography Review