Sigma has used CES to announce redesigned version of its popular 18-200mm f/3.5-6.3 zoom lens and 50mm f/1.4 lenses.
The new Sigma 18-200mm f/3.5-6.3 DC MACRO OS lens. (Source: Sigma.)
The 18-200mm F3.5-6.3 DC Macro OS HSM Contemporary lens is designed specifically for APS-C DSLRs and replaces the 18-200mm F3.5-6.3 II DC OS HSM, which was launched in 2011. The smaller and lighter lens weighs only 430 grams and measures 86 mm in length with a diameter of 71mm. Its optical design has been updated and features 16 elements i n13 groups, with Special Low Dispersion (SLD) glass elements to correct chromatic aberration at the telephoto end along with aspherical lens elements, including double-sided aspherical lenses, to ensure a compact size and excellent correction of distortion.
The minimum focusing distance has been reduced to 39 cm, with a maximum magnification of 0.33x, enabling this lens to be used for close-up shooting with natural light. The new lens accepts 62 mm diameter filters and is supplied with a petal-shaped lens hood.
Sigma’s new 50mm f/1.4 DG HSM Art lens. (Source: Sigma.)
The new Sigma 50mm F1.4 DG HSM Art lens has been reengineered and redesigned to set a new standard of performance in the Art line. Manufactured from metals and a new TSC (Thermally Stable Composite) it features a brass bayonet mount which is accurate and durable. Designed for ‘full frame’ DSLRs, this lens provides a staple focal length for many different types of photography including portraits, landscapes, studio work and still-life. It has been updated to include SLD glass and optimised for improved large aperture performance by positioning wide elements into the front groups. Other updates include an optimised autofocus algorithm for smoother focusing and a floating focusing system to reduce lens movement while focusing.
The new lens features a new matte finish, improved AF on/off switch and guarantees every lens is tested with Sigma’s proprietary modulation transfer function (MTF) “A1” measuring system before being shipped. Now with 13 elements in 8 groups compared to the previous 8 elements in 6 groups, it also has improved close focusing at 40 cm and a maximum magnification ratio of 0.18x.
Both lenses incorporate Sigma’s Hyper Sonic Motor (HSM) system to produce quiet, high-speed auto focus. In addition, they include Super Multi-Layer Coating to reduce flare and ghosting, and to ensure high-quality images throughout the entire zoom range. The 18-200mm F3.5-6.3 DC Macro OS HSM and 50mm F1.4 DG HSM lenses are also compatible with Sigma’s USB dock and the company’s Mount Conversion Service. Details can be found at http://www.sigmaphoto.com.au/sigma/lens/.
