Dynamism in the palm of your hand

Exceptional optical performance and superb build quality give photographers the joy of creating images

– introducing the new ultra-wide
SIGMA 20mm F2 DG DN | Contemporary

This all-new full-frame premium compact prime for mirrorless systems is the latest addition to SIGMA’s I series lineup, combining a bright maximum aperture of F2, an ultra-wide 20mm focal length and stunning optical performance. The lens boasts an exceptionally small form factor, weighing in at just 370g and measuring just 72.4mm in length*, which makes it a highly practical optic that is portable enough for everyday shooting. It’s ideal for landscapes, wide-angle portraits, weddings and interiors, and is particularly well-suited to astrophotography owing to its very well-controlled sagittal coma flare. It is the fourth I series lens with an F2 aperture, joining a 24mm, 35mm and 65mm, which together make a well-matched lens set for L-Mount and Sony E-mount users.

Remarkably, the 20mm F2 DG DN | Contemporary is almost identical in size and weight to the very compact SIGMA 24mm F2 I series. A sleek, all metal design, with a signature I series magnetic lens cap, a manual aperture ring and exceptional production quality means using this lens is a highly intuitive and satisfying experience, making the photo-taking process even more enjoyable. This sharp and beautifully built I series prime, the SIGMA 20mm F2 DG DN | Contemporary captures the essence of the I series, bringing a new level of user experience―the pleasure of owning and using a lens.

*Figures are for L-Mount


©Kim Jenssen

©Adam Klingeteg

©Aya Iwasaki

©Jack Fusco


I series
“Premium Compact Primes”
for mirrorless users

The SIGMA I series features full-frame compatible lenses that offer new value to mirrorless systems. The combination of superb optical performance with a level of compactness that is perfectly suited to smaller and lighter modern mirrorless cameras will bring you new opportunities for a perfect shot.

SIGMA is aware that in today’s world we have a wide range of camera choices, especially with the increase in mobile phone ownership. But with many photographers looking for something more than something that simply captures images when they choose to own a camera and lens, I series lenses offer the ultimate combination of superb optical performance, outstanding usability and compact form-factor.

SIGMA’s excellence in development and production technologies has been built up since our founding in 1961 and became increasingly sophisticated with the introduction of the SIGMA Global Vision brand in 2012. With this as a base, SIGMA has given careful thought to the quality of the products, the feeling of using it and the pleasure of owning it. This is how the I series was born.

20mm, 24mm, 35mm ,50mm and 65mm
five lenses with F2 brightness in the lineup

New standards of optical performance
for the Contemporary line

The 20mm F2 DG DN | Contemporary achieves the highest level of optical performance even at the widest aperture setting of F2 from the center of the image to the periphery. Based on the latest optical design technology, the lens construction includes three high-precision glass-molded aspherical lens elements, one SLD element, and one FLD element to suppress a range of optical aberrations. The result is clear and sharp images even in the extreme corners of the frame. By focusing on the suppression of sagittal coma flare, which is difficult to correct in post-processing, accurate reproduction of very bright points of light has been achieved. This also provides extremely detailed results across the entire image, which is especially important for night sky photography.

The lens’ optical design, as well as its Super Multi-Layer Coating and Nano Porous Coating (NPC), ensures very minimal flare and ghosting even when shooting into bright light sources. This makes it much easier to photograph backlit subjects and still achieve punchy, high contrast results.

Use of multiple high-precision aspherical glass molded lenses

The surface of molds for glass molding, which is a process that forms optical components by pressing glass materials at high temperatures, requires ultra-high precision. SIGMA uses high-precision molds whose surfaces are controlled with an accuracy of ±5 nanometers (0.000005 mm) or smaller. High precision aspherical glass molded lenses archives both good aberration correction and compact lens size.

Mold for aspherical glass molded lenses

SIGMA’s unique coating technology
Nano Porous Coating

The super multi-layer coating is combined with SIGMA’s unique coating technology “NPC (Nano Porous Coating)”. The lens has been designed to be less susceptible to strong incident light such as backlight.
“NPC (Nano Porous Coating)” incorporates porous silica as the coating material. The porous silica layer has nano-sized holes with air inside. Having holes of this size enables a large reduction in the refractive index, allowing the reflectance to be lowered more than conventional anti-reflective coatings. As a result, reflected light causing flares and ghosting is sharply reduced, achieving clear image quality.

Exceptional I series build quality
with a compact form-factor

All I series lenses have an all-metal construction. The precision-cut aluminum parts not only give the barrel a sleek, stylish finish, but provide superb durability that improves the quality of the entire product. Metal materials are also used in internal structures that slide with the operation ring for added robustness. These high-precision components crafted with SIGMA’s cutting-edge metalworking technology are also used in SIGMA’s CINE LENS line-up for professional cinematographers and provide a tactile, ergonomic feel that make the lens a pleasure to use.
The cover ring between the focus ring and the aperture ring has hairline processing that is also used for the rear cylinder of the Art line. This covering functions as a finger hold when attaching or detaching the lens.

Magnetic metal lens cap

I series lenses are accompanied by a dedicated magnetic metal lens cap*, in addition to a normal plastic cap. This dedicated metal cap clips to the front surface of the lens magnetically. It is no exaggeration to say that this meticulously crafted cap represents the finishing touch for the I series.

*Except SIGMA 45mm F2.8 DG DN | Contemporary

※ The image is 35mm
※ Cannot be used when a filter is attached.

Magnetic metal lens cap holder
LENS CAP HOLDER CH-11 (sold separately)

When a cap is removed from the lens it should have a proper place where it can be kept. Using this as a starting point, a cap holder using the magnetic force of the dedicated cap was created.
With the cap attached to the ring plate, and the plate clipped to a bag or belt, the cap is always within easy reach and is less likely to get lost. Plus, its elegant design is a stylish addition to a photographer’s equipment.


Lens construction: 13 elements in 11 groups, with 1 FLD, 1 SLD and 3 aspherical lens elements

Inner focus system

Compatible with high-speed autofocus

Stepping motor

Compatible with Lens Aberration Correction
*Function available on supported cameras only. Available corrections or auto correction functionality may vary depending on the camera model.
*On cameras where lens aberration correction is controlled with ‘ON’ or ‘OFF’ in the camera menu, please set all aberration correction functions to ‘ON'(AUTO).

Support DMF and AF+MF

Nano Porous Coating

Super Multi-Layer Coating

Aperture ring

Focus Mode Switch

Support for switching between Linear focus / Non-linear focus ring settings (for L-Mount only)

Petal-type lens hood(LH656-03)

Magnetic metal lens cap(LCF62-01M)

Mount with dust and splash resistant structure

Compatible with SIGMA USB DOCK UD-11 (sold separately / for L-Mount only)

Designed to minimize flare and ghosting

Every single lens undergoes SIGMA’s proprietary MTF measuring system

9-blade rounded diaphragm

High-precision, durable brass bayonet mount


You'll find our philosophy and craftsmanship
in every product

Our new lineup fully expresses our approach to lenses and photography itself. All of our lenses belong to one of three lines—Contemporary, Art, or Sports—all of which share our development philosophy and advanced manufacturing system. High performance, high quality, and high end in every respect, these lenses give people who love photography lasting value and consistent, exciting results. The secret is our passion for craftsmanship that we put into every production process and every product.


20mm F2 DG DN | Contemporary

Lens Construction

  • SLD glass
  • FLD glass

Lens Construction

11 groups, 13 elements (1 FLD, 1 SLD and 3 aspherical lens elements)

Angle of View

  • 94.5°

Number of Diaphragm Blades

9 (rounded diaphragm)

Minimum Aperture


Minimum Focusing Distance

22cm / 8.7in.

Maximum Magnification Ratio


Filter size


Dimensions (Diameter × Length)

  • L-Mount
    φ70mm × 72.4mm / φ 2.8in. x 2.9in.
  • Sony E-Mount
    φ70mm × 74.4mm / φ 2.8in. x 2.9in.


  • L-Mount
    370g / 13.1oz.
  • Sony E-Mount
    370g / 13.1oz.

Edition Number


Supplied Accessories

Magnetic metal lens cap LCF62-01M, Petal-type lens hood (LH656-03)

Corresponding AF Mounts / Barcode No.

  • L-Mount
  • Sony E-Mount

Performance / Data

MTF Chart

Diffraction MTF

Geometrical MTF

Product Lineup

20mm F2 DG DN | Contemporary

  • L-Mount

    Supplied Accessories

    Magnetic metal lens cap LCF62-01M, Petal-type lens hood (LH656-03)

    Barcode No.
  • Sony E-mount

    Supplied Accessories

    Magnetic metal lens cap LCF62-01M, Petal-type lens hood (LH656-03)

    Barcode No.


Supplied Accessories


Barcode No.


Barcode No.


Barcode No.


* The image is for SIGMA.

  • L-Mount

    Barcode No.
  • Sony E-mount

    Barcode No.

Separately Sold Accessories


Barcode No.


Designed exclusively for the use with a SIGMA Contemporary, Art, or Sports lens and its accessories, the SIGMA USB DOCK allows users to update firmware and adjust the sensitivity of speed to the MF function* through the UD-11.
* Scope of adjustment varies depending on specifications of the individual product.

  • L-Mount

    Barcode No.


Water-repellent, Antistatic type. Protector is developed to protect the lens surface from dirt and dust as well as scratches. It is an ideal filter for regular use as it is completely colorless so does not affect color reproduction.

* Thinner frame wide type.

Barcode No.


Normal type. Protector is developed to protect the lens surface from dirt and dust as well as scratches. It is an ideal filter for regular use as it is completely colorless so does not affect color reproduction.

* Thinner frame wide type.

Barcode No.


UV Water-repellent, Antistatic type. UV filter prevents the bluish tone that generates when the weather is fine, by absorbing ultraviolet rays. It is effective in most situations, such as landscape, portrait and general photography on a sunny day. It is also an ideal filter for regular use as it is completely colorless so does not affect color reproduction.

* Thinner frame wide type.

Barcode No.


PL Water-repellent, Antistatic type. Circular PL filter removes the reflection of water surface and glass windows, and increases the contrast in landscape photography.

* Thinner frame wide type.

Barcode No.

Catalogs / Resources

Manuals / Brochures

Impressions / Samples

  • I bring out the beauty in nature with discipline. | Kim Jenssen

    20mm F2 DG DN | Contemporary Special Impression

    When I go out to create an image I have already planned my image in my head—I know what I want—so to pick those lenses I need for my workflow the SIGMA 20mm F2 DG DN | Contemporary was the ideal. With the SIGMA 20mm F2 DG DN | Contemporary I was able to capture enough information in the files to work with because I like to shoot wider as I need, then I can crop it in post-processing as I want. It is better to have more information in the files than less. Lightweight, high quality and trustworthy. The weight is so low that you don’t feel it in your camera bag when you go for a long walk or hiking and that’s very important.

  • I create my personal style by being myself. | Adam Klingeteg

    20mm F2 DG DN | Contemporary Special Impression

    First of all I immediately fell in love with the focal length. The SIGMA 24-70mm F2.8 DG OS HSM | Art is the lens that I always have attached to my camera no matter what, it is a true workhorse. But being able to get just a bit wider experience through the 20mm F2 DG DN | Contemporary made me give a lot more thought into every shot. It gives you a bit of perspective distortion of the object you’re shooting depending on what angle you shoot it from which you can gain so much advantage from this—capturing a wider scene and playing around with lines in a personal way.

  • I breathe life into photographs by visualizing the melody of scenery. | Aya Iwasaki

    20mm F2 DG DN | Contemporary Special Impression

    The first impression I got of the new SIGMA I series lens, the 20mm F2 DG DN | Contemporary, it was solid and sound. I’ve been familiar with the I series, but the product quality still amazes me. It works perfectly with the fp L and produces excellent image details. It is also so light and small that it does not wear me out even after long hours of shooting; it even makes me feel comfortable. As I am on the slight side, I really appreciate gear that does not put great strain on the neck or shoulders, for it allows me to stay light on my feet during a shoot. Where the focal length is concerned, I find 20mm to be excellent for capturing the grandness and splendor of the landscapes of Hokkaido, which is my main shooting ground. I have had many instances where 20mm fits the bill perfectly when 24mm is too narrow and 18mm too wide.