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Metal Adapter Ring Mount M42 to EOS AI AF PK for Canon Nikon Sony Pentax Camera | eBay
Amazon.com : Fotasy Adjustable M42 Lens to Cannon EF-M Mount Adapter, M42 EFM, M42 EOS M Adapter, Compatible with Canon EF M Mount Mirrorless Cameras EOS M M1 M2 M3 M5 M6