MODEL NO 28mm F1.4 DG HSM | Art BEST-IN-CLASS PERFORMANCE Category  Lenses, Wide Angle Lenses Class Art Typical Photography Creative, Travel, Landscape, Wedding & Events, Family Best-in-class performance Dust- and splash-proof structure Designed to minimize flare and ghosting Designed to meet all shooting conditions Nikon electromagnetic diaphragm mechanism included Manual Override (MO) capable of switching two full-time manual modes. 1 YEAR WARRANTY  The new Sigma wide-angle model stands out with its thoroughly corrected magnification chromatic aberration and sagittal coma flare, as well as completely minimized distortion thanks to its optical design. It features water- and oil-repellent coating on the front lens element and its overall dust- and splash-proof structure ensures excellent performance even in the most challenging shooting conditions. The high-speed AF, thanks to the HSM (Hyper Sonic Motor) with an updated algorithm, captures the perfect moment instantly,This lens is a great contender for street photography, as well as shooting landscapes and night skies. SPECIFICATIONS Lens Construction                                 17 elements in 12 groups Angle of View (35mm)                          75.4° Number of Diaphragm Blades            9 (Rounded diaphragm) Mininum Aperture                                 F16 Minimum Focusing Distance              28cm / 11 in. Filter Size (mm)                                     φ77㎜ Maximum Magnifications                    1：5.4 Dimensions(Diameter x Length)        Φ82.8mm × 107.7mm(3.3 in. x 4.2in.) Weight                                                      865g / 30.5oz.