(From Sigma lens literature) This high performance telephoto zoom lens is ideal for digital SLR cameras. It's the ideal lens for portraits, sports photography, nature photography, and other types of photography that frequently use the telephoto range.
The new multi layer lens coating and lens design reduce flare and ghost, which is a common problem with digital cameras and also creates an optimum color balance through the entire zoom range.
This lens has two SLD (Special Low Dispersion) glass elements in the front lens group and one in the rear lens group, the lens has excellent correction of chromatic aberration through the entire zoom range.
High optical performance is demonstrated throughout the entire zoom range. It also has a switch that converts the lens to macro photography at focal lengths between 200mm and 300mm with a minimum focusing distance of 95cm (37.4 inches). In normal mode the minimum focusing distance is 150cm (59.1 inches) at all zoom settings. Maximum magnification between 200mm and 300mm is 1:2.9 to 1:2.
Note: Sigma has added a motor to the Nikon model, allowing autofocus with all Nikon digital SLRs.
