Telephoto zoom lenses with tele-macro function & optimised for digital SLR cameras The performance telephoto zoom lens is capable of shooting with a maximum magnification of 1:2 at the focal length of 300 mm. Its the ideal lens for portraits, sports photography, nature photography, & other types of photography that frequently use the telephoto range.SLD (Special Low Dispersion) glass This lens has two SLD glass elements in the front lens group & one in the rear lens group, the lens has excellent correction of chromatic aberration through the entire zoom range. This new DG lens is capable of macro photography with a 1:2 maximum magnification at the focal length of 300 mm. The new multi layer lens coating reduces flare & ghost, which is a common problem with digital cameras & also creates an optimum colour balance. Macro shooting with maximum magnification 1:2 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 & 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 & 300mm is 1:2.9 to 1:2.