Canon EF 100mm f/2.8L Macro IS USM or Sigma 105mm f/2.8 EX DG OS HSM?: Canon SLR Lens Talk Forum: Digital Photography Review
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Amazon.com : Sigma 105mm f/2.8 EX DG Medium Telephoto Macro Lens for Minolta and Sony SLR Cameras : Camera Lenses : Camera & Photo
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