Sigma 28-300mm f/3.5-5.6 DL (IF) Aspherical Hyperzoom is an all-in-one, compact, lightweight internal focusing zoom lens. The interal focusing prevents the filter threads from moving during focusing, thus allowing the use of special effect filters. Its lens optical construction consist of 18 elements in 16 groups with SLD and aspherical glass elements for high contrast and edge-to-edge sharpness while correcting chromatic, spherical and coma aberrations. This is a versatile and reliable lens allowing you to capture of on-the-fly moments.