This telephoto zoom lens is optimised for use with digital SLR cameras, capable of macro photography, this lens has a 1:2 maximum close-up magnification at the 300 mm 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. Sigma lens use SLD (Special Low Dispersion) glass for excellent correction of chromatic aberration. This also corrects for fluctuation of aberration due to focusing. The new multi layer lens coating reduces flare and ghosting, a common problem with digital cameras and also creates an optimum colour balance. The minimum focusing distance for this lens is 1.5 m/59 inches at all zoom settings. It also has a switch for change over to macro photography at focal lengths between 200mm and 300mm with a maximum close-up magnification from 1:2.9 to 1:2.