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Amazon.com : Sigma 180mm F2.8 EX APO DG HSM OS Macro for Nikon SLR Cameras : Camera Lenses : Electronics
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Nikon AF Nikkor 180mm F/2.8D IF-ED vs Sigma APO Macro 180mm F2.8 EX DG OS HSM: What is the difference?
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Amazon.com : Sigma 180mm F2.8 EX APO DG HSM OS Macro for Nikon SLR Cameras : Camera Lenses : Electronics
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