The Sigma 20mm F1.4 DG DN Art for Sony E is a fast full-frame ultra-wide prime. It pairs a bright F1.4 aperture with a standard 82mm filter thread, and on an a7 IV, a7C II or a7R V it covers starry skies, landscapes, interiors and events.
Night-sky ready
Sigma designed it with astrophotography in mind. A lens heater retainer holds a dew strap in place, and as well as the front thread there is a rear filter holder for sheet filters.
Optical design
There are 17 elements in 15 groups, including two SLD and three aspherical elements. One of them is a large double-sided aspherical element, which Sigma describes as the largest of its kind it has made.
Controls
An aperture ring with a lock and a click on/off switch, an assignable AFL button and a manual focus lock switch are on the barrel. The petal hood locks in place.
Built for the outdoors
The body is dust- and splash-resistant, and the front element has a water- and oil-repellent coating that makes rain spots and fingerprints easier to wipe off.
Who it's for
This is for landscape and astro photographers who want F1.4 with ordinary screw-in filters. For the widest possible view, the Sigma 14mm F1.4 DG DN goes further, and the Sigma 20mm F2 DG DN is a much smaller and lighter 20mm for travel.
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