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SIGMA 20mm f/1.8 EX DG: bokehlicious picture, but with some serious flaws. Video demo, photo tips. - YouTube
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Sigma Photo 20mm f/1.8 EX DG ASP RF (Canon mount) Wide-angle prime lens for full-frame and APS-C sensor SLR cameras at Crutchfield
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Amazon.com : Sigma 20mm f/1.8 EX DG RF Aspherical Wide Angle Lens for Canon Digital SLR Cameras (OLD MODEL) : Camera Lenses : Electronics
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Amazon.com : Sigma 20mm f/1.8 EX DG RF Aspherical Wide Angle Lens for Sigma SLR Cameras : Camera Lenses : Electronics
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