The Pentax SMC DA 17-70mm f/4 SDM AL IF is a compact and lightweight lens designed to handle extreme close-ups, mid-distance actions shots, and portraits without the weight of heavier lenses. This jack-of-all trades lens delivers exceptional optical quality. The Pentax SMC DA 17-70mm f/4 SDM AL IF offers Pentaxs SDM focusing, quick-shift focus delivering fast and smooth autofocusing, and Super Protect Coating for easy cleaning while repelling moisture, dust, and oil base substance. Developed for Pentax DSLRs with APS-C size sensor, this lens concerts advanced optical technology, extra low dispersion and aspherical elements to account for chromatic and spherical aberration, versatile zoom range, and ultra-wide to medium telephoto range.