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Best Buy: Rokinon Bundle 500mm f/6.3 T-Mount Multicoated Mirror Lens for PENTAX DSLR Cameras ROKINON-40161-KIT
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Amazon.com : Lightdow 500mm f/8 Telephoto Mirror Lens for PK K20D K10D K200D K100D K-5 K-7 K-20D Work with Any Pentax/Ricoh DSLR/SLR K-X Adapter : Electronics
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Opteka 500mm/1000mm f6.3 HD Telephoto Mirror Lens for Pentax K-S1, K-500, K-50, K-30, K5 IIs, K-7, K-5, K-3, K-2, K-X, K - Walmart.com
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Tokina announces new 500mm F8 Reflex telephoto lens for six APS-C, full-frame camera systems: Digital Photography Review
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