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Amazon.com : VILTROX EF-E II 0.71x Speed Booster Auto Focus Lens Mount Adapter Compatible with Canon EF Lens to Sony E-Mount Camera A7 A7R A7RII A7RIII A7S A7SII A7II A7III A6500 A6400
Viltrox Speed Booster Vs. Canon Mount Adapter (Canon M50 EF 50mm 1.8) - YouTube
Viltrox EF-EOS M2 Lens Adapter 0.71x Speed Booster for Canon EF Lens to EOS-M | eBay
ADAPTER vs SPEED BOOSTERS and Crop Factor EXPLAINED - YouTube