Sigma Art 20mm f/1.4 DG DN 20mm

The Sigma 20mm f/1.4 DG DN Art lens delivers class-leading sharpness and dreamy bokeh in a bright ultrawide prime. It's a phenomenal choice for astrophotography and low-light stills, though its weight and inconsistent video autofocus aren't for everyone. At its best price, it's an exceptional value.

Sharpness is the headliner here. In our testing, this lens lands in the top 6% of all products we've ever measured for optical quality. Wide open at f/1.4, center sharpness is bitingly crisp, and the corners don't fall apart the way they do on many fast primes. That means you can shoot starscapes with pinpoint stars across the entire frame. Bokeh, that buttery out-of-focus blur, sits at the 96th percentile. It's rare to see an ultrawide lens produce backgrounds this creamy. Specular highlights render as smooth circles thanks to the 11-blade rounded diaphragm, and the transition from sharp to blurred areas is gentle. The stepless aperture ring is a nice touch for video, but autofocus speed is average, landing right in the middle of the pack. For static subjects and careful composition, the stepping motor is silent and accurate. But if you're tracking a moving subject at 60fps or higher, you'll notice some hunting. It gets the job done for photography, but video shooters might find it frustrating.

The Sony FE 20mm f/1.8 G is the most natural rival. It's noticeably lighter, more compact, and its linear motor delivers snappier autofocus that video shooters will appreciate. But the Sony can't match the Sigma's f/1.4 light-gathering ability or the dreamier background blur. If you're shooting fast action or gimbal work, the Sony makes more sense. For pure stills and astro, the Sigma wins. Another alternative is the Viltrox 15mm f/1.7, which is wider, lighter, and budget-friendly, but its corner sharpness and bokeh don't come close. Tamron's 17-70mm f/2.8 zoom offers stabilization and more flexibility, though you sacrifice a full stop of light and the magical ultrawide perspective. If you're after the best possible image quality in a fast prime, the Sigma is the standout.

The price spread on this lens is wild, ranging from $729 to $1,360. At the low end, you're getting top-shelf optics for under $800, which makes the Sigma an absolute steal for anyone who prioritizes image quality over everything else. Shop around and you might find it closer to $729 at some retailers. At the high end of the range, you're bumping into the Sony FE 20mm f/1.8 G, a lens that's lighter, focuses faster, and is smaller, though it gives up two-thirds of a stop and some of that gorgeous bokeh. If you can snag the Sigma near its floor price, it's one of the best bargains in the E-mount system.

If you've been hunting for a wide-angle lens that gulps light and renders backgrounds into smooth butter, the Sigma 20mm f/1.4 DG DN Art deserves a spot on your shortlist. This E-mount (and L-mount) prime is built for photographers who live in the dark, especially astrophotographers chasing the Milky Way. The 20mm focal length is wide enough for vast night skies and tight interiors, and the f/1.4 aperture pulls in more light than almost any other lens in this class. With a price that swings from $729 to $1,360 depending on the vendor, it's a lens that can be both a screaming deal and a serious investment. We've run it through our database, and the optical performance is stunning. At its core, this is a big, bold piece of glass that puts image quality above all else.

Travel photographers counting every gram and videographers who need reliable continuous autofocus should look elsewhere. The Sony 20mm f/1.8 G is a lighter, faster-focusing alternative that almost disappears on a gimbal. If you want zoom flexibility and stabilization for run-and-gun shooting, the Tamron 17-70mm f/2.8 makes more sense, even though you lose the ultra-wide f/1.4 magic.

If you're a stills photographer who wants the absolute best sharpness and bokeh in an ultrawide, the Sigma 20mm f/1.4 DG DN Art is a knockout. It's tailor-made for astrophotographers and anyone shooting landscapes or environmental portraits in tricky light. The heft and quirky autofocus for video keep it from being the only lens in your bag, but when the sun goes down, this is the one you'll reach for. Catching it at the lower end of its price range makes it an even easier recommendation.