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Amazon.com : K&F Concept Lens Mount Adapter Compatible with Nikon Lens to Pentax K PK Mount Adapter with Glass for Pentax : Electronics
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Nikon Nikkor F Mount D/SLR Lens to Pentax K (PK) Mount SLR Camera Body Pro Mount Adapter – Fotodiox, Inc. USA
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Amazon.com : Fotodiox Pro Lens Mount Adapter Compatible with Pentax K AF (KAF) Lenses to Nikon F-Mount Cameras : Electronics
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