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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,
500 vs 600 - Luminous Landscape
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Canon 100-400f/4.5-5.6L IS II vs Nikkor 200-500mm f/5.6e ed: Canon SLR Lens Talk Forum: Digital Photography Review
Prices Canon compared with Nikon 500mm and 600mm telephoto lenses for sports and bird photography, but also useful for flowers high in rain forest trees (in Guatemala).