Amazon.com : Metabones T Speed Booster Ultra 0.71x Adapter for Canon EF to EF-M Mount (EOS M) Camera : Electronics
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Metabones®
Metabones Speed Booster XL 0.64x Adapter for Nikon F-Mount Lens to Select Micro Four Thirds-Mount Cameras - Walmart.com
Metabones®
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Used Metabones T Speed Booster Ultra 0.71x Adapter MB_SPEF-E-BT2
Amazon.com : Metabones Speed Booster XL 0.64x Adapter for Full-Frame Canon EF-Mount Lens to Select Micro Four Thirds-Mount Cameras : Electronics
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Metabones Speed Booster adapter gives lenses an extra f/stop and nearly full frame focal lengths on APS-C sensors - Newsshooter
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