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Amazon.com: FOTGA Lens Mount Adapter for M42 Mount Lens to Pentax PK K Mount Camera K-S2 K-1 K-3II K-70 K-P : Electronics
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Amazon.com : Bower ABSPK Pentax K Mount to M42 Screw Mount Adapter : Camera Lens Adapters : Electronics
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Amazon.com : Fotodiox Pro Lens Mount Adapter - M42 Screw Mount SLR Lens to Pentax K (PK) Mount SLR Camera Body : Electronics
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