The Sigma 18-125mm f/3.8-5.6 DC OS HSM is a high ratio zoom lens housed in a compact construction and incorporating Sigma’s original OS (Optical Stabiliser) function.
Sigma’s Unique OS (Optical Stabiliser) Technology The lens is equipped with Sigma's own unique OS (Optical Stabiliser) function. This function uses two sensors inside the lens to detect vertical and horizontal movement of the camera and works by moving an optical image stabilizing lens group to effectively compensate for camera shake. This system offers the use of shutter speeds approximately 4 stops slower. It also automatically detects movement of the camera and compensate for camera shake when shooting moving subjects such as motor sports. Compact Construction Its compact construction has an overall length of 88.5mm (3.5""), maximum diameter of 74mm (2.9"") and weight of just 450g/15.9oz (Sigma mount). Close Focusing Capability This lens has a minimum focusing distance of 35cm (13.8"") at all focal lengths, and has maximum magnification of 1:3.8, making it ideal for close-up photography. Super Image Quality SLD (Special Low Dispersion) glass, a molded glass aspherical lens and two hybrid aspherical lenses provide excellent correction for all types of aberrations. The super multi-layer coating reduces flare and ghosting. High image quality is assured throughout the entire zoom range. HSM (Hyper Sonic Motor) This lens incorporates HSM (Hyper Sonic Motor), which ensures a quiet and high-speed autofocus. Inner focusing system The inner focusing system eliminates front lens rotation, making the lens particularly suitable for using the supplied petal-type lens hood and circular polarizing filters. Magnification scale A magnification scale is displayed on the lens barrel, ensuring ease of use