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Amazon.com : Tamron AF 200-500mm f/5.0-6.3 Di LD SP FEC (IF) Lens for Canon Digital SLR Cameras (Model A08E) (Discontinued by Manufacturer) : Camera Lenses : Electronics
Re: 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
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Amazon.com : Sigma 200-500mm f/2.8 APO EX DG Ultra-Telephoto Zoom Lens for Canon DSLR Cameras : Camera Lenses : Electronics
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Amazon.com : Sigma 200-500mm f/2.8 APO EX DG Ultra-Telephoto Zoom Lens for Canon DSLR Cameras : Camera Lenses : Electronics
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