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Ron Martinsen's Photography Blog: B&H Review: Canon EF 70-300mm DO f/4.5-5.6 DO IS USM vs EF 70-300mm f/4-5.6L IS USM
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Amazon.com : Canon EF 70-300mm f/4-5.6L IS USM UD Telephoto Zoom Lens for Canon EOS SLR Cameras : Camera Lenses : Electronics
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