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Amazon.com : Opteka 500mm f/6.3 HD Telephoto Mirror Lens for Canon EOS 80D, 77D, 70D, 60D, 60Da, 50D, 7D, 6D, 5D, 5DS, 1DS, T7i, T7s, T7, T6s, T6i, T6, T5i, T5, T4i,
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Samyang ( Opteka, pro-Optics etc) 500mm F6.3 DX Lens Reviews - Samyang Lenses - Pentax Lens Review Database
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