Sigma 18-50mm f/2.8 DC DN Contemporary lens announced: APS-C mirrorless lens makes a strong first impression
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Amazon.com : Sigma 18-50mm F/2.8 EX DC Lens for Canon Digital SLR Cameras : Digital Slr Camera Lenses : Electronics
Amazon.com : Sigma 18-50mm f/2.8-4.5 SLD Aspherical DC Optical Stabilized (OS) Lens with Hyper Sonic Motor (HSM) for Sigma Digital SLR Cameras : Camera Lenses : Electronics