Amazon.com : Sigma 18-50mm f/2.8-4.5 SLD Aspherical DC Optical Stabilized (OS) Lens with Hyper Sonic Motor (HSM) for Nikon Digital SLR Cameras : Camera Lenses : Electronics
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Amazon.com : Sigma 18-50mm f/3.5-5.6 DC Aspherical Zoom Lens for Pentax and Samsung Digital SLR Cameras : Camera Lenses : Electronics
Amazon.com : Sigma 18-50mm f/3.5-5.6 DC Aspherical Zoom Lens for Pentax and Samsung Digital SLR Cameras : Camera Lenses : Electronics