1) The Sigma 70-300mm F/4-5.6 APO DG Macro lens is a telephoto zoom lens which is ideal for portrait photography.
2)The construction of the Sigma macro lens is made using 14 elements in 10 groups. The number of diaphragm blades in the Sigma lens is 9 to achieve top quality pictures.
3) The minimum angle of view of the Sigma macro lens is 8.2° and the maximum angle of view is 34.3° to give you optimal photographic results.
4)The Sigma 70-300mm F/4-5.6 APO DG Macro lens is especially designed for motorized Canon digital single lens reflex cameras.