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Mark Peters : February 7th 2016 - 08:35 CET

Sigma 20mm prime lens


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SigmaSigma 20mm F1.4 lens for full-frame D-SLR cameras : Sigma, a leading camera and lens manufacturer, is setting new benchmarks for wide-angle image quality with the announcement of the newest Global Vision and market’s first full-frame 20mm F1.4 lens, the Sigma 20mm F1.4 DG HSM Art lens. The new prime lens will become available in Sigma, Canon and Nikon mounts. This 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 outstanding 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.
Sigma 20mm

Sigma 20mm F1.4 DG HSM Art lens
The combination of advanced optics and optimized lens power distribution minimizes spherical aberration, axial chromatic aberration and field curvature, producing outstanding image quality. The wide angle and outstanding 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. From the start of the design process, Sigma took steps to minimize 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. Sigma fans can feel confident knowing that every 20mm lens that leaves Japan’s factory has been tested using Sigma’s own modulation transfer function (MTF) measuring system, “A1.” Other prime lenses in the Art line include: 24mm F1.4 DG HSM, 30mm F1.4 DC HSM, 35mm F1.4 DG HSM, and 50mm F1.4 DG HSM.

Sigma Global Vision lenses

Sigma Global Vision lenses
As with all Sigma Global Vision lenses, the 20mm F1.4 lens incorporates the latest Sigma technology, including an optimized 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 customize full-time manual focus over-ride function settings using Sigma's Optimization Pro software. A new metal lens cap (LC907-02) is also available as a separate accessory for $23.

Prime lens

Sigma 20mm F1.4 Art lens features
• A Hyper Sonic Motor (HSM) that ensures a silent, high-speed AF function. Smoother AF is achieved when this AF algorithm is optimized
• 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
• Technical 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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