Metabones Speed Booster Nikon G lens to Fuji X-mount camera adapter - a hands-on review - Nikon Rumors
Canon has released a 0.71x EF to RF speed booster adapter - DIY Photography
Metabones Speed Booster adapter gives lenses an extra f/stop and nearly full frame focal lengths on APS-C sensors - Newsshooter
Metabones T Speed Booster ULTRA II 0.71x (Fifth Generation) - Canon EF to Sony E-Mount Adapter | Lens / Mount Adapters | Lenses / Accessories | Buy | AbelCine
Metabones T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF Mount Lens to Micro Four Third
Metabones Canon Micro Four Thirds T Speed Booster Adapter for sale online | eBay
Viltrox vs. Metabones: Speed Booster for the Blackmagic Pocket Cinema Camera
Metabones Speed Booster adapter - full review - EOSHD.com - Filmmaking Gear and Camera Reviews
New Metabones Speed Booster Series for BMPCC 4K | CineD
Metabones T Speed Booster Ultra 0.71x Adapter MBSPEF-EFM-BT1 B&H