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Different M42 to PK-Adapters - a review: Pentax SLR Talk Forum: Digital Photography Review
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M42-PK
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M42-PK-IN
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T-Mount (T / T-2) Screw Mount SLR Lens to Pentax K (PK) Mount SLR Camera Body Adapter – Fotodiox, Inc. USA
K&F Concept M10221 M42 Screw Lenses to Pentax K Lens Mount Adapter - KENTFAITH
