Sigma are an ultra-wide angle pioneer, having developed and launched many extraordinary products in this category. The new 12-24mm ART lens is perfect for the era of ultra-high resolution digital cameras, offering an optimal package of centre-to-edge image quality, minimized distortion and a minimum focusing distance. Sigma has used its lens design expertise and cutting edge technologies to deliver these qualities without compromise using advanced materials such as low dispersion glass and advanced lens processing methods, for a lens with an extremely large diameter.