The 35mm is a staple focal length in the world of photography and paired with Sigma technology, this lens can take artistic expression to the next level The lens is equipped with technology including a Hyper Sonic Motor (HSM), floating internal focusing system, SLD and FLD Glass elements The HSM ensures quiet, high speed, accurate autofocusing while the floating focusing system allows for superior optical performance with subjects at a closer shooting distance The SLD glass elements along with the FLD glass elements, which are equal to fluorite, help correct both axial and chromatic aberration The large 1.4 aperture makes it ideal in low light The Sigma 35mm 1.4 DG HSM is a must-have for any camera bag