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Pentacon 500mm f/5.6 Prakticar MC Lens with Tripod Collar {118} with 2x Interchangeable Mounts (M42 Screw Mount, Pentacon Six) at KEH Camera
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Amazon.com : K&F Concept Lens Mount Adapter Compatible with Pentacon 6 Kiev 60 Lens to Nikon AI F Mount Camera D90 D300 D700 D7100 D7000 (Pentacon-Nikon) : Electronics
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