The smc PENTAX-DA★ 200mm F2.8 ED[IF] SDM is a uni-focal telephoto lens with a focal length equivalent to 307mm in the 35mm format. With a maximum aperture of F2.8, it is ideal for indoor sports events and stage performances requiring fast shutter speeds to freeze action, and for portraits against a smooth, beautiful out-of-focus background. Featuring advanced technologies such as special optical glass elements and PENTAX-original lens coatings, it is designed to assure exceptional optical performance and deliver clear, high-contrast images, even at image-field edges. It also features ED (extra-low dispersion) optical elements in its second and fifth lens.