Model no

20mm F2 DG DN


Dynamism in the palm of your hand

  • I series - Premium Compact Primes for mirrorless users
  • Exceptional optical performance 
  • Superb I series build quality in all-metal with a compact form-factor 
  • Ultra-wide
  • Compatible with full-frame cameras
  • Weighs only 370 g
  • Minimum focusing distance of 22 cm
  • Mount with dust- and splash-proof structure
  • Magnetic Lens Cap and Metal Lens Hood
  • Typical Photography: Landscape, Wide-angle portraits, Weddings, Interiors, Astrophotography
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SIGMA 20mm F2 DG DN | Contemporary
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 72.4 mm 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

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.

>> More about I series

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.

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.

Additional features

• 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 may vary depending on the camera model.
• Support DMF and AF+MF
• Nano Porous Coating
• Super Multi-Layer Coating
• Aperture ring
• Focus Mode Switch
• Petal-type lens hood(LH656-03)
• Magnetic metal lens cap(LCF62-01M)
• Mount with dust and splash resistant structure
• Support for switching between linear and non-linear focus ring settings (for L-Mount only)
• 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
“Made in Japan” craftsmanship

More Information
Product LinesContemporary
Construction13 elements in 11 groups
Lens TypeWide Angle
Sensor SizeFull Frame
Angle of view94.5 (Full-frame), 70.7° (APS-C)
Number of diaphragm blades9 (rounded diaphragm)
Minimum apertureF22
Minimum focusing distance22 cm
Maximum magnification ratio1:6.7
Dimensions (diameter x length)

Sony E-mount

⌀ 70 mm x 72.4 mm
⌀ 70 mm x 74.4 mm

Weight (g)370 g
Filter diameter⌀ 62mm
Edition numberC022
Supplied AccessoriesMagnetic Metal Lens Cap LCF62-01M, Front Cap LCF-62 Ⅲ, Petal-Type Lens Hood LH656-03, Rear Cap LCR II
AccessoriesSIGMA USB Dock UD-11 (L-Mount), SIGMA WR Protector 62mm, SIGMA Protector 62mm, SIGMA WR UV Filter 62mm, SIGMA WR Circular PL Filter 62mm

Sony FE


* All figures calculated by L-Mount. Note: The L-Mount Trademark is a registered Trademark of Leica Camera AG. About Product Name: Product name includes "DG" when the lens is designed to deliver the ultimate in performance on cameras with full-frame sensors, and "DN" when the lens design is optimized for mirrorless cameras with the short flange focal length.
Lens Construction
Geometrical MTF Chart
Diffraction MTF Chart