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Amazon.com : Sigma 150-500mm f/5-6.3 AF APO DG OS HSM Telephoto Zoom Lens for Nikon Digital SLR Cameras : Digital Slr Camera Lenses : Electronics
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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 : Nikon 500mm f/4.0G ED VR AF-S SWM Super Telephoto Lens for Nikon FX and DX Format Digital SLR : Camera Lenses : Electronics
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