Sigma 20mm F1.4 DG HSM Art Lens

Sigma announced the world’s first 20mm F1.4 wide-angle prime lens designed for Full Frame cameras but will work with APS-C sensors as well. The Sigma 20mm 1.4 DG HSM Art lens offers the widest large aperture Art lens to date. The latest optical design allows for the utmost in image quality with careful attention paid to edge to edge performance. 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 optimized lens power distribution minimizes spherical aberration, axial chromatic aberration and field curvature, producing outstanding image quality. With class leading performance, this lens is ideal for landscape photography, videography, astrophotography, lowlight/indoor photography and event photography. As with all Global Vision lines, the 20mm will be tested using the proprietary “A1” measuring system ensuring the highest standard of operation. The Sigma 20mm Art is compatible with the USB dock to update and customize and is also compatible with the Mount Conversion Service. A staple procedure for the Global Vision lines, every lens will be tested using the proprietary “A1” measuring system.

“While many saw the development of a 20mm lens for today’s super-resolution DSLRs as challenging, Sigma approached it head-on utilizing 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 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. 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.

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 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
• Specifications:
  • Weight of 33.5 ounces;
  • Diameter and length of 3.6 inches by 5.1 inches
  • Minimum aperture of F16; and angle of view (35mm) of 94.5°
  • Minimum focusing distance of 10.9 inches
  • Maximum magnification ratio of 1:7.1

Price and Availability
The Sigma 20mm F1.4 DG HSM Art lens will become available late November 2015 for $899, and will be available in Sigma, Canon and Nikon mounts.