Sigma 28mm f/1.8 EX DG Aspherical Macro Large Aperture Wide Angle Lens for Canon SLR Cameras,Sigma 28mm f/1.8 EX DG Aspherical Macro Large Aperture Wide Angle Lens for Canon SLR Cameras,Sigma EX DG Aspherical DG DF Macro 28mm F1.8 Lens Reviews - Sigma Lenses - Pentax Lens Review Database,Sigma 28mm f1.8 D EX DG Macro Aspherical AF Lens for Nikon from Japan SLR Camera,Sigma 28mm f1.8 D EX DG Macro Aspherical AF Lens for Nikon from Japan SLR Camera,