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LYUMO M42-PK M42 for Pentax PK K Mount Adapter Ring Focus Infinity M42-PK , M42-PK, M42-PK adapter - Walmart.com
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Amazon.com : Fotodiox Lens Mount Adapter (Type 2), M42 (42mm x1 Thread Screw) Lens to Pentax Q-Series Camera, fits Pentax Q Mirrorless Cameras : Electronics
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