Sigma's 70-300mm f/4-5.6 APO Macro Super is a compact Apochromatic tele-zoom lens incorporating two Special Low-Dispersion glass elements in the front lens group, plus one Special Low-Dispersion glass element in the rear lens group to minimize chromatic aberration. It is capable of focusing down to 1:2 (half life-size) reproduction ratio at 300mm focal length (an optional accessory 58mm achromatic close-up lens allows even closer focusing and reproduction ratios up to 1:1 or life-size) with superb optical quality. A detachable bayonet hood is provided. The lens materials used in this product are lead- and arsenic-free ecological glass.