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Sigma's mm f/4 DG OS HSM Art lens, shown with the supplied lens hood attached (Source Sigma) The optical design (shown below) consists of 19 elements in 14 groups and includes three aspherical elements, two elements made from FLD (fluoritelike low dispersion) glass and two SLD (Special Low Dispersion) elements, as shown in the diagram belowThe Sigma 2470mm F28 DG OS HSM Art isn't claimed to be a macro lens, but it delivers quite good performance nonetheless if you zoom to 70mm It has a minimum focusing distance of 37cm / 150in and a maximum magnification ratio of 148 The following example demonstrates how close you can get to your subjectThere's no denying that the Sigma 2470mm f/28 DG OS HSM Art is a great zoom lens with impressive image quality The stabilization system and price point tip the balance in favor of the Sigma over samebrand offerings Plus, the Sigma is lighter weight than a Nikon version, but a touch heavier than a Canon version Sigma 24 70mm F 2 8 Dg Os Hsm...