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Commander Optics 420-800mm (w/ 2X- 840-1600mm) f/8.3-16 HD Telephoto Zoom 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, K110D and K10D Digital SLR
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SMC Pentax-6x7 / S-M-C Takumar 6x7 / Takumar 6x7 800mm F4 Reviews - 67 Telephoto Primes - Pentax Lens Reviews & Lens Database
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Amazon.com : 420‑800mm F8.3-16 Super Telephoto Lens,Manual Focusing Zoom Lens Telephoto Telescope,Alloy + Optical Glass Lens,for Pentax PK Mount Camera Body : Electronics
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Amazon.com : Vbestlife High-Power 420mm/800mm F/8.3-16 Manual Telephoto Zoom Lens for Canon//Minolta/Nikon/Pentax/ and Other DSLR Cameras. : Electronics
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