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Authorized Sigma USA Dealer, Full USA Model and AVOID Gray-Market Sigma lenses from other sellers, they have NO Truly a revolutionary product, the Sigma 18-35mm 1. 8 DC HSM is the first wide-angle to standard zoom lens to achieve a large aperture of 1. 8. Designed specifically for APS-C sized sensors, the Sigma 18-35mm 1. 8 translates to 27mm-52. 5mm on 35mm camera. Tapping into Sigma’s long history of lens Innovations, the 18-35mm 1. 8 DC HSM incorporates a wide glass molded aspherical lens with Special Low Dispersion (SLD) glass to compensate for aberrations and curvature at the widest angle. Internal focusing and zooming allows for more usability and functionality. The 18-35mm is ideal for landscapes, portraits, still life, snap shots, casual, and close-ups and the Hyper Sonic Motor (HSM) ensures smooth, fast and accurate autofocusing. The use of Thermally Composite Material (TSC) reduces size and weight but increases the lens durability. Its new Global Vision design works with its compatibility with the Sigma USB dock for further customization. A 9 blade rounded diaphragm also creates beautiful background blur. The Sigma 18-35mm 1. 8 DC HSM is a new benchmark in photographic history and a must have for every camera bag. Specifications Lens Construction: 17 Elements in 12 Groups Angle of View: 76. 5-44. 2 Minimum Focusing Distance: 28 cm / 11in. Diaphragm Blades: 9 Minimum Aperture: f16 Filter Size (mm): 72mm Maximum Magnifications: 1: 4. 3 Dimensions: 4. 8 x 3. 1 x 3. 1 Weight: 1. 79lbs Included Items Sigma 35mm F1. 8 DC HSM | A Sigma 4-Year USA Sigma Lens Case Sigma Lens Hood Sigma Lens Caps.