Convenient wide-angle zoom with a fixed f/2.8 aperture through the entire zoom range.. Light & compact everyday carry lens.. Built-in optical image stabilization for less camera shake while hand-holding on-the-go.. Incredible quality from edge-to-edge due to 4 UD elements to minimize chromatic aberration, and 2 aspheric lenses.. Impressive durability and weather-resistant construction equivalent to an L-series lens for use in harsh environments.