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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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Amazon.com : Metabones Canon EF to BMPCC4K T CINE Speed Booster Ultra 0.71x (MB_SPEF-m43-BTA) : 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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