Amazon.com : Lightdow 900mm F8.0 Telephoto Mirror Lens + T2 Mount Adapter Ring for PK K20D K10D K200D K100D K-5 K-7 K-20D Work with Any Pentax/Ricoh DSLR/SLR K-X Adapter : Electronics
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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