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Amazon.com : Vivitar 650-1300mm f/8-16 Telephoto Lens with 2X Teleconverter (=2600mm) Kit for Canon EOS Rebel SL1, T3, T3i, T5, T5i, 70D, 6D, 7D 5D Mark II III Cameras : Camera Lenses :
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Amazon.com : 650‑1300mm F8‑F16 Manual Focus Telephoto Zoom Lens with Adapter Ring for Nikon AI‑Mount Camera, for Ultra‑Long‑Distance Shooting : Electronics
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