The SP AF10-24mm F/3.5-4.5 Di II LD Aspherical (IF) featuring an unprecedented 2.4X zoom ratio in its class of ultra wide-angle zoom lenses. The innovative, high-performance ultra wide-angle zoom lens is designed exclusively for Pentax.The SP AF10-24mm Di II, the first-ever 2.4x ultra wide-angle lens for digital SLR cameras, features a focal length range with the 35mm equivalent of 16mm ultra wide-angle to 37mm semi-wide-angle in a user-friendly lightweight, compact design. With this versatile ultra-wide-angle zoom lens, photographers can capture magnificent vistas and extraordinary close-ups, bold compositions and unique perspectives, creating imagery impossible with standard wide-angle lenses.The advanced optical system of this ultra wide angle lens features large-aperture, glass-molded aspherical elements, hybrid aspherical elements, as well as elements made of special low-dispersion glass, all of which combine to deliver high-quality imagery and performance.