The Sigma 70-300 mm f/4-5.6 DG Macro Autofocus Lens for Nikon Camerais capable of shooting with a maximum magnification of 1:2 at thefocal length of 300 mm. Featuring SLD (Special Low Dispersion) glass,this telephoto zoom lens corrects chromatic aberration throughoutthe zoom range. The SLD glass brings an optimum colour balance whilealso reducing flare and ghosting. It also has a switch that convertsthe lens to macro photography at focal lengths between 200mm and300mm with a maximum close-up magnification from 1:2.9 to 1:2. TheSignal AF 70-300 mm lens lets you change the shooting magnificationwithout altering the distance between the camera and the subject.