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Tutorial on adjusting infinity focus on Pentax M42 lenses.: Pentax SLR Talk Forum: Digital Photography Review
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M42 Thread Lens to for PK Mount Camera Lens Adapter for Pentax K 3 K 30 K 50 K 5 II K 5 IIs K7 K S1 K r K20D K100D|Lens Adapter| - AliExpress
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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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