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 XL 0.64x Adapter for Canon EF Lens to BMPCC
Amazon.com : Metabones Speed Booster Ultra 0.71x Adapter for Canon EF Lens to Sony E Mount T Speed Booster : Electronics
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 EF Lens to BMPCC 4K Camera
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Metabones T CINE Speed Booster ULTRA 0.71x (5th Generation) - Canon EF to Sony E-Mount Adapter | Lens / Mount Adapters | Lenses / Accessories | Buy | AbelCine
Amazon.com : Metabones T Speed Booster Ultra 0.71x Adapter for Canon EF Lens to BMPCC4K Camera : Electronics
Review: 7 Days with Metabones' Canon EF Speed Booster
Metabones®
Metabones T CINE Speed Booster XL 0.64x Adapter, Canon EF Lens to BMPCC4K Camera MB_SPEF-M43-BTB
GEAR REVIEW: The Metabones Speed Booster for that Full-Frame Look Pt1