Sigma 17-50 2.8 OS

SPECIFICATIONS Lens Construction 17 Elements in 13 Groups Angle of View 72.4º-27.9º Number of Diaphragm Blades 7 Mininum Aperture f22 Minimum Focusing Distance 28 cm / 11 in Filter Size (mm) 77mm Maximum Magnifications 1:5 Dimensions (Diameter x Length) 83.5x91.8 mm/3.3x3.6 in Weight 565g / 19.9oz. Corresponding Mounts Sigma OS HSM EX DC Nikon OS HSM EX DC Canon OS HSM EX DC Sony/Minolta HSM EX DC Pentax HSM EX DC OS - Optical Stabilizer Function HSM - Hyper-Sonic Motor EX - EX Lens DC - DC for Digital *Vignetting will occur if the lens is used with digital cameras with image sensors larger than APS-C size or 35mm SLR cameras. * For Pentax mount, if the camera body does not support HSM, auto focus will not be available. * OS function is not available for Sony and Pentax mounts. *The appearance, specifications, and the like of the product may be subject to change for improvement. MTF CHART LENS CONSTRUCTION