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Amazon.com : Bower ABSPK Pentax K Mount to M42 Screw Mount Adapter : Camera Lens Adapters : Camera & Photo
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Pentax M42 to K Mount Adapter (Genuine / Original Pentax product) - Extension Tubes & Lens Adapters - ShaShinKi
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Amazon.com : Fotodiox Lens Mount Adapter (Blk), M42 Lens (42mm thread Mount) Lens to Pentax (PK) Camera, fits Pentaxist DS, DS2, D, DL, DL2, K10D, K20D, K100D, K110D, K200D, K100D Super, K-5,
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