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Amazon.com : 500mm f/8-32 HD Preset Telephoto Lens for Pentax K-1, K-S2, K-S1, K-500, K-70, K-50, K-30, K5 IIs, K-7, K-5, K-3 II, K-2, K100D, K110D and K10D Digital SLR Cameras :
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Opteka 500mm f/8 Telephoto 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, K-X, K20D, K100D, K110D and K10D Digital SLR Cameras -
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