This ultra wide angle zoom lens is designed specifically for crop sensors and will produce a focal length equivalent of 18-32mm. It offers a fast maximum aperture that is constant throughout the zoom range, making it a great choice for nightscapes, moody interiors, or any other lower-light subject that calls for an expansive view. Equipped with a stepping motor AF system, this lens will delivery impressively quiet performance for both photographers and videographers. Additionally, this lens will focus as close as 5.9" when shooting at the wide end of its range. Coupled with a max magnification ratio of 1:4 (or quarter life size), this lens provides ultra-wide macro shooting to produce unique perspectives.