The DA 16-45 features a 3X zoom ratio with focal lengths covering ultra-wide angle to normal ranges, while a high-refraction extra low dispersion (ED) glass element produces high-resolution, high-contrast images with true-to-life color rendition. Moreover, the aspherical lens element helps the transmission of the light more efficiently through the lens to the image sensor. The sec P-DA J 16-45mm F4.0 ED/AL is well-suited for advanced amateurs and professionals.