Aimed directly at professional and enthusiast portrait and fine art photographers, SIGMA 85mm F1.4 DG DN | Art has features that read like a portrait lens wish list. The first of course is the potential for bokeh and other benefits of an enhanced optical background effect for both portrait and nature subjects. Next, SIGMA has paid special attention to achieve optimum results at any aperture, and especially when wide open. The lens incorporates an impressive assemblage of high refractive index glass, five Special Low Dispersion (SLD) elements and an aspherical lens, resulting in the absence of colour bleeding and bothersome backlight effects, centre to edge sharpness, and a unique presence throughout. Numerous lens controls and functions make it an apt choice for both still and video photography.