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Amazon.com : Lightdow 650-1300mm F8.0-16 Super Telephoto Manual Zoom Lens + T2 Adapter for Pentax K20D K10D K200D K100D K-5 K-7 K-20D Work with Any Pentax/Ricoh DSLR/SLR K-X Adapter (for Pentax Mount,
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Amazon.com : 500mm BOWER Telephoto Lens Kit for Pentax dSLR Models ist, istDL, K10D, K100D, K20D, K200D, K-x, K-r, K-5, K-7 : Digital Slr Camera Lenses : Electronics
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