![]() To ensure stability in focusing, this lens moves the inner lens group(s) without changing the lens’ physical length. The Sigma 18-35mm is also designed to be the world’s first wide-aperture lens that has an aperture of F1. This lens uses a motor driven by ultrasonic waves to provide a quiet, high-speed AF. The aspherical lens complex allows freedom of design, improved performance, a reduced number of component lenses and a compact size. Their specialized design gives these lenses the ideal properties for digital cameras, the compact and lightweight construction is an added bonus! ASP (ASPHERICAL) : These are special lenses designed for APS-C size sensors so that the image circle matches the smaller size of the image sensor of most digital SLR cameras. What is the difference between Canon EF 16-35mm f/2.8L II USM and Sigma 18-35mm F1.8 DC HSM A Find out which is better and their overall performance in the. The Sigma 18-35mm 1.8 DC HSM is a new benchmark in photographic history and a must have for every camera bag. A 9 blade rounded diaphragm also creates beautiful background blur. Its new Global Vision design works features compatibility with the Sigma USB dock for further customization. The use of Thermally Composite Material (TSC) reduces size and weight but increases accuracy of the lens construction. The 18-35mm is ideal for landscape photography, portrait photography, still life photography, snap shots, casual photography, and close-ups and the Hyper Sonic Motor (HSM) ensures smooth, fast and accurate autofocusing. Internal focusing and zooming allows for more usability and functionality. 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. The Hyper Sonic Motor provides fast, quiet and smooth auto focusing that is well-suited for use with video applications. ![]() ![]() Designed specifically for APS-C sized sensors, the Sigma 18-35mm 1.8 translates to 27mm-52.5mm on 35mm camera. 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.
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