Sigma 18 35mm f18 dc hsm is the first zoom lens ever to achieve a maximum aperture of f18 throughout the zoom range it is a wide aperture standard zoom lens for digital single lens reflex camera39s with aps c size sensor39s the lens has a focal range equivalent to 27mm 525mm in a 35mm format and it can cover the angles of view of multiple fixed focal length lenses this wide aperture standard zoom lens enables the photographer to expand creative possibilities on any occasion our art line de