Categories: OS Standard, Class: Contemporary, Typical Photography: Travel, Wedding and Events, Family, Macro, Technology: HSM, OS and Macro Functionality, Lens Hood, Lens Caps are Included, Ideal All Purpose Lens for APS-C DSLRs, HSM Ensures Quiet, Accurate and Fast Autofocusing while the OS Compensates for Camera Shake when Shooting Handheld, Design of the 17 – 70 mm Includes State of the Art TSC Material (Thermally Stable Composite) which Allows for a Durable Construction as well as Reduction in Size by 30% Compared to Conventional Models, 2 FLD Glass Elements (with Performance Equal to Fluorite) are Incorporated along with 1 SLD Element to Reduce Color Aberration at the Highest Degree and Obtain Unmatched Image Quality, 17 – 70 mm f/2.8 – 4 Macro DC HSM OS is Compatible with the Sigma USB Dock for an Increased Level of Customization, Including Firmware Updates as well as Focus Parameter Adjustment Changes, Aspherical Lens Elements