Sigma 20mm f/1.4 DG HSM Art Lens for L-Mount

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The World’s First F1.4 Ultra-Wide-Angle Lens
Advanced Technologies Make This 
20mm F1.4 Lens Possible

The SIGMA 20mm F1.4 DG HSM | Art lens for L-mount 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.

Ideal High-Speed Lens With Top-level
Performance For The Ultra-High-Megapixel Era

The SIGMA 20mm F1.4 DG HSM | Art Lens for L-mount has a native L-mount Digital camera such as SIGMA fp, the lens provide 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 Sony E-mount digital cameras, this high-performance lens delivers outstanding resolution and high-clarity image quality even at wide-open aperture.

To Be Enjoyed On L-Mount Cameras.

Since the announcement of L-mount Alliance, SIGMA is pleased to announce the launch of the Art line prime lens lineup for full-frame cameras in L-Mount including these SIGMA 20mm F1.4 DG HSM Art Lens. These L-Mount series lenses have achieved high-speed AF and are fully compatible with AF-C mode, in-camera image stabilization, and in-camera aberration correction.

Incredible Rendering Performance Delivers Unprecedented Visual Experiences.
Enjoy Enhanced Control Of Light And Composition.

SIGMA has extensive experience in leveraging its advanced design capabilities and leading-edge technologies to craft large-aperture prime lenses that bring out the full potential of ultra-high-megapixel L-mount Mirrorless Camera such as SIGMA fp. As its latest achievement in this category, SIGMA has created an ultra-wide-angle lens with F1.4 brightness. With a focal length of 20mm and F1.4 aperture, this lens delivers outstanding large-aperture brightness and bokeh, delivering unprecedented visual experiences. Allowing the photographer to leverage the perspective provided by the wide -angle and the shallow depth of field provided by the large aperture, this lens is ideal not only for such ultra-wide-angle subjects as landscapes and starry skies, but also for snapshots in low light, indoor photography, portraits with a natural bokeh effect, and much more.

The Finest In Materials, Usability And Functionality.
A Refined, Integrated Design Made With The Photographer In Mind

For this SIGMA 20mm F1.4 DG HSM | Art lens for L-mount the lens caps 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.

Lens construction

15 elements in 11 groups

Angle of view (35mm)


Number of diaphragm blades

9 (Rounded diaphragm)

Minimum aperture


Minimum focusing distance

27.6 cm / 10.9 in.

Maximum magnification ratio


Dimensions (diameter x length)

φ90.7mm × 129.8mm / φ3.6in. × 5.1in.


950g / 33.5oz.

Edition number*


Corresponding AF Mounts


* About Edition number
The three-digit code on the surface of the lens is to indicate the year the lens was first released.
(Since it is different from the year of manufacture, the release year and edition number may not match depending on the mount.)

Lens Construction

Sigma 20mm F1.4 DG HSM Art Lens Construction

Lens Distortion

Sigma 20mm F1.4 DG HSM Art Lens Distortion

Diffraction MTF

Sigma 20mm F1.4 DG HSM Art Lens Diffraction MTF

Geometrical MTF

Sigma 20mm F1.4 DG HSM Art Lens Geometrical MTF


Sigma 20mm F1.4 DG HSM Art Lens Vignetting

In the Box:

  • Sigma 20mm f/1.4 DG HSM Art Lens for L-mount
  • LC907-01 Cover Lens Cap
  • Sigma Rear Cap LCR II for L-Mount Lenses
Find a Dealer |
Code: 4412969 MPN: 412969

or interest free for up to 12 months with

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