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Amazon.com : Opteka T-Mount (T2) Adapter Compatible with Canon EF EOS 80D, 77D, 70D, 60D, 60Da, 50D, 7D, 6D, 5D, 5Ds, T7i, T7s, T6s, T6i, T6, T5i, T5, T4i, T3i, T3, T2i,
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Amazon.com : Opteka 500mm/1000mm f/8 Manual Telephoto Lens Compatible with Canon EF-Mount EOS 90D, 80D, 77D, 70D, 60D, 60Da, 1Ds, Mark III II 7D, 6D, 5D, 5DS, Rebel T8i, T7i, T7s, T7,
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Amazon.com : Fotodiox Lens Mount Adapter - M42 Type 2 Screw Mount SLR Lens to Canon EOS (EF, EF-S) Mount SLR Camera Body : Electronics
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Amazon.com : Vivitar 500mm f/8.0 Telephoto Lens with 2x Teleconverter (=1000mm) + Accessory Kit for Canon EOS 60D, 6D, 7D, 5D Mark II III, Rebel T3, T3i, T4i Digital SLR Cameras :
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Amazon.com : Fotodiox Lens Mount Adapter - Compatible with C-Mount CCTV/Cine Lenses to Canon EOS (EF, EF-S) Mount D/SLR Cameras : Electronics
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