Unlimited ultra-wide creativity
Explore endless creative possibilities. By combining an exceptional F1.4 aperture with an ultra-wide-angle 20mm focal length, create expressive landscapes and astrophotography photos with uncompromised results. The unique ability to attached a front and rear filter allows for a variety of filter combinations for any situation.

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.
^{*Although this construction allows the lens to be used in light rain, it is not the same as being waterproof.}

Features such as a focus mode switch, a customisable AFL* button, and an aperture ring lock switch enhance the lens usability.
^{*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.
^{*Sold separately}

Beautiful bokeh
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.

Other features

• Inner focus system.
• Compatible with high-speed autofocus.
• Stepping motor.
• Compatible with lens aberration correction.^*1
• Support for DMF and AF+MF.
• Compatible with AF assist (Sony E-mount only).
• Super multi-layer coating.
• Aperture ring with click switch and lock switch.
• AFL button.*²
• MFL switch.
• Focus mode switch.
• Designed to minimise flare and ghosting.
• Every single lens is evaluated with SIGMA’s proprietary MTF measuring system.
• High-precision, durable brass bayonet mount.

^{*1 – Function available on supported cameras only. Available corrections may vary depending on the camera model.
*2 – Only on compatible cameras. Available functions may vary depending on the camera used.}