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efs to ef adapter canon, Amazon.com : EF-EOS M Lens Adapter Auto-Focus Ring Compatible for Canon EF/EF-S Lens and Canon EOS-M (EF-M Mount) Camera EOS M2 M3 M5 M6 M10 M50 M100 : Electronics, Amazon.com : Vello Auto Lens Adapter for EF/EF-S Lenses to Canon EOS M Camera : Electronics