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Using a Pentax K to M42 Adapter - YouTube
Amazon.com : Fotodiox Pro Lens Mount Adapter - M42 Screw Mount SLR Lens to Pentax K (PK) Mount SLR Camera Body & Replacement Rear Lens Cap Compatible with Pentax K Mount DSLR
K&F Concept M10221 M42 Screw Lenses to Pentax K Lens Mount Adapter - KENTFAITH
K&F Concept M10221 M42 Screw Lenses to Pentax K Lens Mount Adapter - KENTFAITH
K&F Concept M10221 M42 Screw Lenses to Pentax K Lens Mount Adapter - KENTFAITH