Sigma 20mm F1.4 DG DN Art Lens: Ultra-Fast, Ultra-Sharp, Ultra-Wide

The Perfect Prime for Landscapes, Travel, and Astrophotography

This full-frame, ultra-wide-angle prime lens for mirrorless cameras is ideal for night sky photography, landscapes, interiors, weddings, travel, and architecture. Its ultra-wide F1.4 aperture ensures very fast shutter speeds in low light conditions and a very shallow depth-of-field for pronounced subject separation.

The lens comes with professional-level features including an aperture ring with de-click and lock switches, an AFL button, a lockable lens hood, a rear filter holder, a lens heater retainer, and a manual focus lock feature. The optical design includes two SLD and three aspherical elements, one of which is the largest double-sided aspherical glass element in Sigmas history. These advanced optics ensure minimal chromatic aberration, sagittal coma flare, and image distortion, delivering highly detailed images with exceptional sharpness and accuracy from the centre to the periphery of the frame.

The 20mm boasts exceptional optical performance, with almost no chromatic aberration, excellent corner sharpness, and very well-controlled flare.

Outstanding Build Quality

The exceptional build quality of the Sigma 20mm F1.4 DG DN is characteristic of an Art-line lens, featuring high-quality materials, overall ergonomics, and craftsmanship. The exterior barrel is made from Thermally Stable Composite (TSC), a strong and lightweight polycarbonate with a thermal expansion rate similar to aluminium, ensuring consistent performance in varying temperatures.

The focus ring is rubberised for easier operation, and focusing is internal, meaning the lens never changes length, making it ideal for gimbal use as the centre of gravity remains fairly constant. The rear of the barrel features an aperture ring that can be de-clicked for stepless aperture changes. When set to Auto, aperture is controlled by the camera. A lock switch allows users to lock the ring in Auto or Manual, preventing accidental changes.

To reduce flare and ghosting in bright sunlight and to protect the front element from damage, the lens has a robust petal-type lens hood with a lock button. A rubberised ring on the hood makes for easier removal and fitting. The durable brass mount is surrounded by a rubber seal to help keep out dust and moisture.

Professional Feature Set

The lens includes an AF/MF switch, a customisable AFL switch, and switches to de-click and lock the aperture ring. The Manual Focus Lock switch allows users to completely deactivate the focus ring once focus is acquired, ensuring that focus won’t change if the ring is accidentally knocked.

Rear Filter Holder

The Sigma 20mm F1.4 features an 82mm filter thread at the front of the lens and a rear filter holder. Rear filters, available from several manufacturers, are about the size of an SD card, small and light, and positioned between the camera and lens to avoid damage or dirt. A special template included with the lens makes it easy to cut filters by hand from gel sheets.

High-Performance Optics

The Sigma 20mm F1.4 DG DN Art lens delivers outstanding optical quality, with excellent detail rendering into the corners even wide open at F1.4. Its advanced optical design includes 17 elements in 15 groups, with 3 aspherical elements and 2 SLD elements. This design ensures razor-sharp results and eliminates chromatic aberration, flare, distortion, and vignetting. Advanced optical coatings reduce flare and ghosting in bright sunlight, creating high-contrast images with rich colours and strong blacks.

Ideal for Environmental Portraits

The F1.4 aperture and ultra-wide angle make this lens ideal for environmental portraits, where a subject is portrayed in context with their surroundings. The shallow depth-of-field helps the subject stand out from the background.

Close-Up Shooting

With a magnification ratio of 1:6.1, the 20mm can shoot relatively close-up for an ultra-wide-angle lens. This equates to a minimum focusing distance of 23cm, putting the subject about 12cm from the lens end. Combined with a shallow depth-of-field, this makes for attractive close-up images.

Key Specifications

• Lens Construction: 17 elements in 15 groups
• Angle of View: 94.5
• Diaphragm Blades: 11 (rounded)
• Minimum Aperture: F16
• Minimum Focusing Distance: 23cm
• Maximum Magnification Ratio: 1:6.1
• Filter Thread: 82mm
• Dimensions: 87.8mm 111.2mm
• Weight: 635g
• AF Mounts Available: L-Mount, Sony E

Mount Barcodes

• L-Mount: 00-85126-414696
• Sony E: 00-85126-414658

The Sigma 20mm F1.4 DG DN Art lens is a must-have for low-light interiors, environmental portraits, and close-up shooting, delivering superb edge-to-edge detail even on the highest resolution cameras.