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Amazon.com : Sigma 30mm f/1.4 EX DC HSM Lens for Nikon Digital SLR Cameras : Camera Lenses : Electronics
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Sigma 30mm f/1.4 EX DC HSM Practical Review and Video Test: Canon SLR Lens Talk Forum: Digital Photography Review
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Amazon.com : Sigma 30mm f/1.4 EX DC HSM Lens for Nikon Digital SLR Cameras : Camera Lenses : Electronics
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