Amazon.comThe Sigma 70-300mm f4-5.6 DG Macro Lens for Canon Digital SLR Cameras is a telephoto lens that offers excellent cost performance and is optimized for use with digital SLR cameras. Capable of macro photography, this lens has a 1:2 maximum close-up magnification at the 300 millimeter focal length. It's the ideal high performance lens for portraits, sports photography, nature photography, and other types of photography that frequently use the telephoto range. The lens features a switch for changeover to macro photography at focal lengths between 200 millimeters and 300 millimeters, with a maximum close-up magnification from 1:2.9 to 1:2.The multi-layer lens coating and lens design reduce flare and ghosting, which is a common problem with digital cameras, and it also creates an optimum color balance through the entire zoom range. The minimum focusing distance is 59 inches at all zoom settings. The lens features a switch for changeover to macro photography at focal lengths between 200 millimeters and 300 millimeters with a maximum close-up magnification. Without changing the distance between camera and subject, you can change the shooting magnification.From the ManufacturerThis is a telephoto zoom lens with excellent cost performance, for it is capable of macro photography with a 1:2 maximum close-up magnification at the 300 mm focal length. It also has a switch for changeover to macro photography at focal lengths between 200 mm and 300 mm. The minimum focusing distance is 1.5 m/59 inches at all zoom settings. We used SLD (Special Low Dispersion) glass in this lens for excellent correction of chromatic aberration. And, we effectively corrected for fluctuation of aberration due to focusing. It is the ideal lens for portraits, sports photography, nature photography, and other types of photography that frequently use the telephoto range.Corresponding AF Mount:Sigma, Canon, Minolta, Nikon (D) and Pentax