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M42 Screw-mount lenses on Pentax DSLR cameras Overview - YouTube
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The Evolution of the Pentax M42 Mount - Articles and Tips | PentaxForums.com (Mobile)
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S-M-C (m42) vs SMC (k-mount) test: Adapted Lens Talk Forum: Digital Photography Review
Random Camera Blog: Keep using those M42-mount lenses on newer non-M42 bodies
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Pentax M42 to K Mount Adapter | MY CAMERA CABINET
Pentax K-mount - Wikipedia
K&F Concept M10221 M42 Screw Lenses to Pentax K Lens Mount Adapter - KENTFAITH
M42 Screw Mount SLR Lens to Pentax K (PK) Mount SLR Camera Body Pro Mount Adapter – Fotodiox, Inc. USA
Different M42 to Pentax K mount adapters - PentaxForums.com
