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Sigma 200-500mm f/2.8
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Amazon.com : Sigma 150-500mm f/5-6.3 Auto Focus APO DG OS HSM Telephoto Zoom Lens for Canon Digital SLR Cameras : Camera Lenses : Electronics
Shooting Sigma's "Big Three" f/2.8 Pro zoom lenses in the Arizona desert
Sigma 200-500mm f/2.8
