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20mm-f1.4-DG-HSM-A-F

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 were SIGMA’s advanced manufacturing technologies, which the company has developed over time by producing a wide range of ultra-wide-angle and large-aperture lenses. For example, milestone lenses such as SIGMA 12-24mm F4.5-5.6 EX DG ASPHERICAL HSM, SIGMA 8-16mm F4.5-5.6 DC HSM, and SIGMA 18-35mm F1.8 DC HSM | Art were completely original products that helped SIGMA develop outstanding design and production know-how and its current high-precision, high-efficiency production system. In turn, these advances made possible the new SIGMA 20mm F1.4 DG HSM | Art. Moreover, SIGMA’s advanced optical design minimizes distortion, transverse chromatic aberration, sagittal coma flare, and the reduction of brightness toward the edges of the image. Delivering top performance even at wide-open aperture, this lens can be considered the culmination of SIGMA’s Art line.

* Left side: The aspherical glass element incorporated in the SIGMA 18-35mm F1.8 DC HSM | Art、Right side: The aspherical glass element incorporated in the SIGMA 20mm F1.4 DG HSM | Art.Incredible rendering performance delivers unprecedented visual experiences. Enjoy enhanced control of light and composition SIGMA has created an ultra-wide-angle lens with F1.4 brightness.

Advanced technologies make a 20mm F1.4 lens possible.
World’s first 20mm F1.4 lens—thanks to advanced large-diameter aspherical lens manufacturing technologies.

The ideal high-speed lens for snapshots and much more.
Top-level performance for the ultra-high-megapixel era.

The finest in materials, usability and functionality.
A refined, integrated design made with the photographer in mind.

SIGMA USB DOCK makes customization and flexible adjustment possible.
SIGMA USB DOCK for SIGMA GLOBAL VISION lenses (optional)

New SIGMA GLOBAL VISION product lines are setting new benchmarks for image quality.
Evaluation with SIGMA’s own MTF measuring system: A1

Available mount conversion service (charges apply).
Continue using your favorite lens with a different camera body.

Source: https://www.sigmaphoto.com/20mm-f1-4-dg-hsm-a