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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
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Amazon.com : Opteka 500mm f/6.3 (with 2X- 1000mm) Telephoto Mirror Lens for Nikon F-Mount D6, D5, D4, D850, D810, D800, D780, D750, D610, D600, D7500, D7200, D5600, D5500, D5300, D3500 and D3400
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