Special Fixed Lenses



Product Details


Model No: A20DGHS     UPC Code: 085126412562


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SRP: $1249.95

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  • World’s first 20mm F1.4 lens – thanks to advanced, large-diameter aspherical manufacturing technologies. To offer an ultra-wide-angle 20mm focal length and F1.4 brightness at wide-open aperture, this lens incorporates a large double aspherical lens 59mm in diameter. Lenses of this type had been considered extremely difficult to manufacture, but SIGMA took on the challenge to realize an F1.4 ultra-wide-angle lens that fulfills the strict performance requirements of the SIGMA Art line. What made this breakthrough possible was SIGMA’s advance manufacturing technologies, which the company has developed over time by producing a wide range of ultra-wide-angle and large aperture lenses.
  • Minimized chromatic aberrations. This lens minimizes chromatic aberrations, a common issue in large-aperture ultra-wide-angle lenses. It features two FLD (“F” Low Dispersion) glass and five SLD (Special Low Dispersion) glass elements to minimize transverse chromatic aberration, which is mainly visible around the edge of the image. The optimized lens power distribution helps maintain axial chromatic aberration. As a result, this lens delivers high image quality in every situation without color smearing, and its rendering performance is consistently sharp with high contrast.
  • Minimized distortion. Distortion is common issue in wide-angle lenses, and it is not possible to correct it simply by changing the aperture value. For this reason, a lens must be designed from the start to minimize this issue. By adjusting the incidence angle of light starting with the first lens element and incorporating optimally positioned aspherical glass elements, the SIGMA 20mm F1.4 DG HSM Art lens minimizes distortion throughout the entire image.
  • Designed to minimize flare and ghosting. From the start of the design process, SIGMA took steps to minimize flare and ghosting and establish an optical design that is resistant to strong incidental light source as backlight. At the prototyping stage, SIGMA used not only simulations but actual photographic experiments to assess flare and ghosting under multiple criteria, identify the cause of these issues under a wide range of situations and take measures to mitigate them. In addition, SIGMA’s Super Multi-Layer Coating helps further reduce flare and ghosting and provide sharp, high-contrast images even in backlit conditions.
  • Top-level performance for the ultra-high-megapixel era. At the dawn of the film camera, there was very little high-sensitivity film and bright lenses that worked well in low-light conditions came to be known as “high speed lenses”. These lenses are ideal for shooting indoors, in the evening, under cloudy skies, or in any low-light situation. Since the SIGMA 20mm F1.4 DG HSM Art provided the benefits of an ultra-wide angle lens with minimal distortion, it is ideal for photographing landscapes, starry skies and architecture. In addition to capturing wide-angle shots with the whole scene in focus, the photographer can leverage wide-open aperture to take snapshots with the subject in focus and the background blurred with an attractive bokeh effect. Designed for ultra-high-megapixel digital cameras, this high-performance lens delivers outstanding resolution and high-clarity image quality even at wide-open aperture.
  • Sigma USB Dock compatible. With the optional SIGMA USB DOCK, you can update the lens firmware and adjust parameters such as focus. Simply connect the lens to the SIGMA USB Dock and the dock to a computer to use the dedicated SIGMA Optimization Pro software and perform various types of customization and adjustment.
  • High-quality design features. In our new product lines, the lens cap and AF/MF switches are newly designed to improve usability. To ensure precise operation, internal parts feature generous use of metal and Thermally Stable Composite (TSC), which is highly compatible with metal parts. The lens barrel is engraved with the year of release for instant access to this information.
  • We used to measure lens performance with MTF measuring system using conventional sensors. However, we have now developed our own proprietary MTF measuring system (A1) using 46-megapixel FOVEON direct image sensors. Even previously undetectable high-frequency details are now within the scope of our quality control inspections. The SIGMA 20mm F1.4 DG HSM will all be checked using this “A1” before they are shipped.
  • Rounded diaphragm. The 9-blade rounded diaphragm creates an attractive blur in the out-of-focus areas of the image.
  • Hyper Sonic Motor ensures high AF speed.
  • Brass bayonet mount.
  • Lens construction: 15 elements in 11 groups Minimum aperture: F16 Angle of view (35mm): 94.5 degrees Minimum focusing distance: 27.6cm (10.9 inches) Dimensions 90.7mm dia. x 129.75mm (3.6 x 5.1 inches) Number of diaphragm blades: 9 rounded Maximum magnification ratio: 1:7.1 Weight: 950 grams (33.5 oz.)
  • Made in Japan
  • 7-year Canadian warranty


Packaged Dimensions
Width : 6.9 in
Length : 4.7 in
Height : 4.7 in
Weight : 2.7 lb


7 Year
Your new Sigma product is guaranteed under the Gentec International warranty against manufacturing defects...

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Awards & Reviews
  • Sigma 20mm f1.4 is a Stunner - Resource Magazine - February 2016

  • Amateur Photographer (UK) - Testbench Gold Award - December 2015


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