Wide-Angle to Telephoto Zoom Macro Lens For Sigma APS-C Cameras Only Optical Stabilization (OS) Hyper-Sonic Motor (HSM) Thermally Stable Composite Material Minimum Focusing Distance of 13.7" 4 Special Low Dispersion (SLD) Elements 3 Aspherical Glass Elements Super Multi-Layer Lens Coating Brass Made Bayonet Mount