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This Sigma AF 18-125mm F3.5-5.6 EX DC zoom lens was exclusively designed for use with digital Single-Lens Reflex (SLR) cameras and has 6.9 times high magnification zoom ratio. Image circle is designed to match the size of the image sensor of digital SLR cameras. A Special Low Dispersion (SLD) and two pieces of aspherical glass elements produce high levels of optical performance through the entire zoom range. This has resulted in a compact, lightweight lens. This lens has a minimum focusing distance of 50cm (19.6in.) at all focal lengths and is equipped with an inner focusing system. Since the front of the lens does not rotate, a Petal Shaped Hood and a circular polarizing filter can be easily attached and used. This lens is also equipped with Zoom Lock Switch that eliminates Zoom Creep. Product Description: Sigma zoom lens - 18 mm - 125 mm Weight: 13.6 oz Length: 3 in Min Focus Range: 19.7 in Lens System: Zoom lens Optical Zoom: 6.9 x Lens Aperture: F/3.5-5.6 Focus Adjustment: Automatic, manual Focal Length: 18 mm - 125 mm Mounting Type: Nikon F Lens Construction: 14 group(s) / 15 element(s) Filter Size: 62 mm Special Functions: Zoom