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Mamiya 645 (M645) Mount Lenses to Pentax K (PK) Mount SLR Camera Body Pro Mount Adapter – Fotodiox, Inc. USA
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Amazon.com : Urth Lens Mount Adapter: Compatible for Nikon F Lens to Pentax K Camera Body : Electronics
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Pixco Pentax 67 lens to Pentax PK K mount adapter Pentax K 3, K 50, K 5 II, K 30, K 01, K 5, K r, K x, K 7, K m, K20D, K200D, K1|Lens Adapter| - AliExpress
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Sigma Announces Lens Compatibility Issues with K-1 - Third-Party Announcements | PentaxForums.com (Mobile)
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