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Amazon.com : Canon EF 180mm f3.5L Macro USM AutoFocus Telephoto Lens for Canon SLR Cameras : Camera Lenses : Electronics
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Sigma reveals APO Macro 180mm F2.8 EX DG OS HSM full-frame 1:1 macro lens: Digital Photography Review
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Sigma APO EX DG OS HSM 180mm f/2.8 Macro Lens for Canon Mount - Black | Digital SLR Lenses | Sigma at Unique Photo
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Telephoto macro lenses, such as Canon EF 180mm f/3.5 L USM, are essential for nature photography, especially photography of flowers in trees - maya-ethnobotany.org
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