Sigma 35mm f / 1.4 DG HSM Art lens is a new lens model from the Japanese manufacturer. An enhanced 50mm prime lens, it provides the highest image quality in the 50mm lens category. The Sigma AF 50mm f / 1.4 EX DG HSM ART belongs to the class of Art lenses, which corresponds to the mark on the lens barrel with the letter "A". The main difference from other "fifty kopecks" is that the Sigma AF 50mm f / 1.4 EX DG HSM ART does not degrade image quality at the widest aperture. The lens is equipped with a state-of-the-art ultrasonic motor (HSM) for fast and accurate focusing. The lens material is a heat-resistant composite material, which allows the lens to be used in different temperature ranges. A light filter with a common diameter of 77mm is mounted on the lens.