In recent years, standard macro lenses have tended to use internal focusing to maximize autofocus speed. In contrast, the new SIGMA 70mm F2.8 DG MACRO Art lens is designed to prioritize optical performance to meet the demanding image quality requirements that define the Art product line. It delivers impressive resolution and incredible clarity for the mid-telephoto range, well beyond the expectations of a macro lens. The ironless DC motor further enhances image quality, while an optimized algorithm provides exceptionally smooth autofocus performance for a heavier powerful lens. Photography enthusiasts will surely remember a legendary, absolutely sharp macro lens - the Sigma Macro 70mm F2.8 EX DG Macro - and be delighted that it is now available in a new form; updated with the outstanding quality of the Art product line. To achieve peak performance at any shooting distance, the lens features an extending, dual-group floating focus mechanism. For optimal results at all shooting distances, this configuration minimizes aberrations. To minimize longitudinal chromatic aberrations, the optical system includes two FLD glass elements, two SLD glass elements, and one element with a high rate of anomalous partial dispersion and a high refractive index. In addition, two aspherical lens elements help to increase resolution at short shooting distances. This optical system enables a razor-sharp focus area that contrasts with a bokeh area free of color streaks.