Noted as one of the many standard zoom available to Nikon users. The Sigma 17-70mm offers a relatively long zoom range 4x ratio coupled with an impressive large maximum aperture at 17mm. The 17-70mm DC is specifically designed for the reduced image circle of today's APS-C DSLRs where the field of view is equal to 26-150mm (full format). Optimized with tight controls, no wobbling and a mild Zen finish is great for everyday use. The designated HSM deliver quiet and fast autofocusing. The lens offers 17 elements in 13 groups lens construction, fast aperture, 8.7-inch minimum focusing distance, 72.4-20.2° viewing angle, 72mm filter thread and zoom lock.