Unlimited ultra-wide creativity
The ultimate wide-angle lens for astrophotography
Utilising sophisticated optical design technology, with 17 glass elements arranged in 15 groups, including two SLD, three aspherical glass elements and the largest class double-sided aspherical glass element in SIGMA’s history, the 20mm F1.4 DG DN | Art rigorously suppresses various optical aberrations such as sagittal coma flare and image distortion to produce highly-detailed images with exceptional sharpness and accuracy from the centre to the furthest corners of the lens. With its brilliant optical power and its full range of useful features despite its compact and lightweight body, the SIGMA 20mm F1.4 DG DN | Art is the ultimate choice when photographing the night sky.
Designed for the most demanding conditions
The dust and splash resistant* structure combined with a water and oil-repellent coating on the front glass element make the SIGMA 20mm F1.4 DG DN | Art safe to use during longer outdoor shoots, especially during the night.
Features such as a focus mode switch, a customisable AFL* button, and an aperture ring lock switch enhance the lens usability.
* Although this construction allows the lens to be used in light rain, it is not the same as being waterproof.
*Only on compatible cameras. Available functions may vary depending on the camera used.
Lens Heater Retainer
Keep the lens free from night dew by utilising the built in Lens Heater Retainer. The extended lip at the front of the lens stops an attached lens heater* from slipping over the front element, preventing lens vignetting.
The wide F1.4 aperture allows for fast shutter speeds and to freeze a subject in frame, while creating beautiful shallow depth-of-filed effects. Take precise control with the clickable aperture ring. An aperture ring click switch is provided to turn off this function for a smooth aperture control system designed for videographers.
Compatible with front and rear filters
Outstanding design and high-precision manufacturing capabilities made it possible to equip a front filter thread despite the very large F1.4 aperture and 20mm ultra-wide viewing angle. The lens also comes with a rear filter holder, allowing the freedom to combine multiple filters to suit a huge variety of shooting situations.
Manual focus lock switch
Turn on the MFL (Manual Focus Lock) to disengage the manual focus ring. Set the lens to the desired position, turn on the lock and concentrate on your shot without worrying about accidentally changing the focusing distance. Ideal for long exposure photography and video.
Upgraded lens hood
The included petal-shaped lens hood is equipped with a lock mechanism to keep the hood securely fastened to the lens, A rubberised grip area makes it easy to attach and remove the hood in one quick and easy process.
● Inner focus system
● Compatible with high-speed autofocus
● Stepping motor
● Front filter thread (82mm)
● Compatible with lens aberration correction*
* Function available on supported cameras only. Available corrections and 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 for DMF and AF+MF
● Compatible with AF assist (Sony E-mount only)
● Super multi-layer coating
● Aperture ring
● Aperture ring click / de-click switch
● Aperture ring lock switch
● AFL button*
* Only on compatible cameras. Available functions may vary depending on the camera used.
● MFL switch
● Focus mode switch
● Support for switching between linear and non-linear focus ring settings (L-Mount only)
● Petal-type lens hood with lock (LH878-04)
● Compatible with SIGMA USB DOCK UD-11 (sold separately; L-Mount only)
● Designed to minimise flare and ghosting
● Every single lens is evaluated with SIGMA’s proprietary MTF measuring system
● High-precision, durable brass bayonet mount
● “Made in Japan” craftsmanship
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.
Evaluation with Sigma's own MTF measuring system “A1”
We used to measure lens performance with MTF measuring system using conventional sensors. However, we’ve now developed our own proprietary MTF (modulation transfer function) measuring system (A1) using 46-megapixel Foveon direct image sensors. Even previously undetectable high-frequency details are now within the scope of our quality control inspections. The SIGMA 50mm F1.4 DG HSM will all be checked using this “A1” before they are shipped.
* A1: Aizu1
“Made in Japan”
All Sigma’s manufacturing – right down to moulds and parts – with a few exceptions, are carried out under a single integrated production system, entirely in Japan. We are now one of the very few manufacturers whose products are solely “made in Japan”. We like to think our products are somehow imbued with the essence of our homeland, blessed as it is with clean air and water, and focused, hard-working people. We pride ourselves on the authentic quality of Sigma products, born of a marriage between highly attuned expertise and intelligent, advanced technology. Our sophisticated products have satisfied professionals and lovers of photography all over the world because our manufacturing is based on genuine craftsmanship, underpinned by the passion and pride of our experts.
Applicable for the Mount Conversion Service
As an experienced lens manufacturer that has been creating a diverse range of interchangeable lenses, we have started the innovative chargeable service “Mount Conversion Service”. With this service, the mount of your current SIGMA lenses can be changed to another mount of your choice. It gives a new life to your favourite lenses when you wish to use it on a different camera body.
* This “Mount Conversion Service” is different from a normal repair. In order to apply for the service, please contact your nearest authorised subsidiary/distributor of SIGMA.
Weather Resistant Sealing
|Angle of View||94.5°|
|Lens Construction||17 elements in 15 groups|
|Number of Diaphragm Blades||11 Blades (Rounded diaphragm)|
|Minimum Focusing Distance||23cm|
|Dimensions||L-Mount: 87.8mm×111.2mm / 3.5in.x4.4in.
Sony E-mount: 87.8mm×113.2mm / 3.5in.x4.5in.
Sony E-mount: 630g
Corresponding AF Mounts
Unlimited ultra-wide creativity
Diffraction and Geometrical MTF Chart - 20mm F1.4 DG DN | Art
Unlimited ultra-wide creativity
82mm Size Selection
Front Lens Cap
Protects the front element of a lens. Available to order as a replacement or back up. *Supplied with a most SIGMA lenses.
Lens Hood for 20mm F1.4 DG DN | A (LH878-04)
The Lens Hood LH878-04 is designed specifically for the Sigma 20mm F1.4 DG DN | Art. The hood will help protect the front element of the lens whilst also reducing lens flare. Supplied in the box with the SIGMA 20mm F1.4 DG DN | Art
Rear Lens Cap
Supplied with a most SIGMA lenses. Available to order for replacement or back up.