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Sigma Corporation presents 20mm F1.4 lens for full-frame DSLRs --
Mon, 19 Oct 2015 16:31
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Sigma Corporation of America, a DSLR lens and camera manufacturer, has announced the newest Global Vision full-frame 20mm F1.4 lens, the Sigma 20mm F1.4 DG HSM Art lens.
This prime lens is designed to bring out the full potential of ultra-high-megapixel DSLR cameras. With a focal length of 20mm and F1.4 aperture, this lens delivers impressive large-aperture brightness and bokeh. Through decades of experience in lens design and Sigma Global Vision lens craftsmanship, the 20mm incorporates both F Low Dispersion (FLD) glass, and five Special Low Dispersion (SLD) glass in a design of 15 elements in 11 groups. The combination of advanced optics and optimised lens power distribution minimises spherical aberration, axial chromatic aberration and field curvature, producing outstanding image quality. The wide angle and image quality make this lens great for seascape, cityscape, and astrophotography, as well as for photos in low light, indoor photography, portraits, and event and wedding photography.
While many saw the development of a 20mm lens for today s super-resolution DSLRs as challenging, Sigma approached it head-on utilising our advanced manufacturing technologies to create the world s first 20mm F1.4 ultra-wide-angle lens, said Mark Amir-Hamzeh, president of Sigma Corporation of America. This new lens is a result of years of experience by the company s optical engineers in developing state-of-the-art lens designs and proven production knowledge, and high-precision craftsmanship by our factory team in Aizu, Japan.
From the start of the design process, Sigma took steps to minimise flare and ghosting, and established an optical design that is resistant to strong incidental light sources such as backlight with its Super Multi-Layer Coating. As with all Sigma Global Vision lenses, the 20mm F1.4 lens incorporates the latest Sigma technology, including an optimised autofocus (AF) algorithm for smooth, fast, and accurate focusing. In addition, Thermally Stable Composite (TSC) compound material is used, which has a high affinity to metal parts, consistently performs well at extreme temperatures, and reduces the size and weight of the lens.
This lens is compatible with Sigma s USB Dock, (sold separately) which allows photographers to update the lens firmware, adjust focus points and customise full- time manual focus over-ride function settings using Sigmas Optimisation Pro software.
The Sigma 20mm F1.4 Art lens will also feature:
A Hyper Sonic Motor (HSM) that ensures a silent, high-speed AF function. Smoother AF is achieved when this AF algorithm is optimised
A nine-blade, rounded diaphragm creates an attractive blur to the out-of-focus areas of the image
A brass bayonet mount of highly precise and durable construction to enhance mount s strength and long-term wear resistance
Specifications: Weight of 33.5 ounces; a diameter and length of 3.6 inches by 5.1 inches; a minimum aperture of F16; and angle of view (35mm) of 94.5 ; minimum focusing distance of 10.9 inches; and a maximum magnification ratio of 1:7.1
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