Model A037 is a new line of ultra-wide-angle zoom lens, which has a separate concept from SP 15-30mm F/2.8 Di VC USD (Model A012), with superb image quality in a small body for high portability . At just 90mm in length and 460g in weight, it is the smallest and lightest in its class. The focal length ranges from an ultra-wide 17mm suitable for professional landscape photography, to a standard 35mm good for snapshot photography. As for F-stops, the wide-angle end is a large aperture F/2.8, and even at telephoto end is a fast F/4. With Moisture-Resistant Construction and Fluorine Coating, the lens enhances the user’s photographic experience. For those who would like to try out an ultra-wide-angle zoom lens for the first time, as well as those who are looking for a lens that is easily portable, the A037 is the definitive choice.