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 Sigma’s 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
