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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
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Amazon.com : Metabones Speed Booster Ultra 0.71x Adapter for Canon EF Lens to Sony E Mount T Speed Booster : Electronics
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Metabones T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF Mount Lens to Micro Four Third
Metabones ULTRA Speed Booster Adapter with Support Foot for Canon EF-Mount Lens to Sony E-Mount (MB_SPEF-E-BM2) at KEH Camera
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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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