This zoom lens, designed specifically for Pentax DSLRs, has a focal length equivalent to 27mm to 82.5mm in the 35mm format and an angle-of-view equivalent to a 27.5mm-84mm lens in the 35mm format. It uses the Quick-Shift Focus system to toggle between Auto and Manual focus. Aspherical lens elements are used to reduce aberrations and Super Protective coating makes the lens resistant to water and dust.