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Amazon.com : Opteka 420-800mm f/8.3 HD Telephoto Zoom Lens for Pentax K-70, K-50, K-3 II, KP, K-1, K-S2, K-S1, K-500, K-30, K5 IIs, K-7, K-5, K-2, K20D, K100D, K110D and K10D Digital
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Amazon.com : Pentax K-5 II 16.3 MP DSLR Body Only (Black) (OLD MODEL) : Slr Digital Cameras : 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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