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Amazon.com : Fotodiox Pro Lens Mount Adapter Compatible with Mamiya RB67/RZ67 Mount Lens to Canon RF Mount Mirrorless Camera Body with Built-in Focusing Helicoid : Electronics
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Mamiya RB67 Mount SLR Lens to Pentax K (PK) Mount SLR Camera Body Pro Mount Adapter – Fotodiox, Inc. USA
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