Sigma 18-50mm F3.5-5.6 DC Lens for Canon SLR Digital Camera 521-101 - This Zoom lens was exclusively designed to suit the characteristics of digital SLR cameras. The image circle was designed to match the size of the image sensors of digital SLR cameras, and this produced a compact lens with a maximum diameter of 60mm (2.3in.), overall length of 67.5mm (2.6in.) and Weight of only 245gr (8.6 ounces). It has a variable angle of view of 69.3degree~27.9degree. The use of aspherical lenses provides correction for various aberrations throughout the entire zoom range and produce high level of Optical performance. 18-50mm F3.5-5.6 DC lens has a minimum focusing distance of 25cm (9.8in.) at all focal lengths and is capable of Macro photography with a maximum magnification ratio of 1:3.5.