Introducing the all-new 20mm F2 DG DN | Contemporary from SIGMA. This ultra-compact, wide-aperture prime lens for E-mount and L-Mount systems is a game changer for mirrorless users needing a sharp, wide-angle optic that isn’t going to weight them down. This portable, full-frame premium compact prime for mirrorless cameras is the seventh lens in SIGMA’s fast-growing I series lineup, combining a bright maximum aperture of F2, an ultra-wide 20mm focal length and stunning optical performance. It’s also the widest lens in the range so far, opening up new photographic possibilities for I series users.

The lens boasts an exceptionally small form factor, weighing in at 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’s the fourth I series lens with an F2 aperture, joining a 24mm, 35mm and 65mm, which together make a well-matched lens set for photographers who need both performance and portability in their kitbag. Remarkably, the 20mm F2 DG DN | Contemporary is almost identical in size and weight to the SIGMA 24mm F2 I series. Its sleek, all metal design, with a signature I series magnetic lens cap, a manual aperture ring and exceptional build quality makes using this lens is a highly intuitive and satisfying experience.

*Figures are for L-Mount

Key features

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 modern mirrorless cameras offer up 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 a product, the feeling of using it and the pleasure of owning it. This is how the I series was born.

New standards of optical performance for the contemporary line
The 20mm F2 DG DN | Contemporary achieves the highest level of optical performance even wide open, from the centre 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 provides extremely detailed results across the entire image, which is especially important for night sky photography.

The lens’ advanced 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 aluminium 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 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 minimise 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
Key specifications (The figures below are for L-Mount)

Lens construction: 11 groups, 13 elements (1 FLD, 1 SLD and 3 aspherical elements)
Angle of view: 94.5°
Number of diaphragm blades: 9 (rounded diaphragm)
Minimum aperture: F22

Minimum focusing distance: 22cm
Maximum magnification ratio: 1:6.7
Filter size: 62mm
Dimensions (max diameter x length): 70mmx72.4mm

Weight: 370g

Barcode

L-Mount: 0085126 490690 | Sony E-mount: 0085126 490652

Supplied accessories

MAGNETIC METAL LENS CAP LCF62-01M, FRONT CAP LCF-62 III, PETAL-TYPE LENS HOOD LH656-03, REAR CAP LCR II L-MOUNT OR SONY E-MOUNT

Optional accessories

SIGMA USB DOCK UD-11 for L-Mount

SIGMA WR PROTECTOR 62mm

SIGMA PROTECTOR 62mm

SIGMA WR UV FILTER 62mm

SIGMA WR CIRCULAR PL FILTER 62mm