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Sigma 17-70mm F/2.8-4.5 DC Macro K Mount Autofocus Lens For Pentax APS-C Sensor DSLRS {72} at KEH Camera
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Sigma 17-70mm F2.8-4 DC Macro HSM C Sony and Pentax mount lens review: Smaller, lighter and improved uniformity - DXOMARK
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Amazon.com : Sigma 17-70mm F2.8-4 Contemporary DC Macro OS HSM Lens for Pentax : Camera Lenses : Electronics
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