This lens is an upgrade from a Nikon 20mm f/2.8. It is close to being optically perfect. Although there is no VC, the focus is very fast and quiet. This completes a trio of Sigma Art primes - 20, 35 and 50 mm. Can't praise Sigma enough for these fine primes.

In my opinion, one of the best developments to happen in photography recently is the stepped-up offerings of third party...

During the last decade the ultra-wide segment has been dominated by zoom lenses but it seems as if prime lenses are about to enter a renaissance. Lately Nikon released a 20mm f/1.8 and we've seen a bunch of updates from Zeiss and some promising announcements from a new player (irixlens.com).

Sigma's Art series of f/1.4 prime lenses has delivered consistently strong performance, and its latest entry, the 20mm F1.4 DG HSM Art ($899), is no exception. It manages to capture sharp, ultra-wide images, a heck of a lot of light, and focus close so you have the option of blurring the background...

Sharp from edge to edge; Minimal distortion; Short minimum focus distance; Available for multiple systems

Heavy; Dim corners and edges; No support for filters

Sigma's latest offering in the Art Lens portfolio is an ultra-wide 20mm full frame lens, for Nikon, Canon and Sigma fit. Not only that, but an extra-bright f/1.4 aperture makes this a desirable optic from the start. All looking good in theory, now let's see how it handled and performed in practice.

Superb optical quality; Well made; High control of CA; Excellent handling; Excellent AF performance

Price penalty for f/1.4 aperture; Heavy and bulky; Not weather resistant

The Sigma 20mm F1.4 DG HSM is a very fast, tack-sharp prime lens in Sigma's excellent Art series, and also a unique lens to boot, as it's the only 20mm lens in the World to offer an f/1.4 aperture.

Everything came on time as expected. Haven't had a chance to go out and use the lens yet but it looks like everything works beautifully. My fiancé says the bag is cute with the purple and gray inside lining. Yeah purple means it's hers.

I bought this lens for night astrophotography primarily. This lens does have many great uses at all apertures. Very sharp, great resolution, some distortion which is normal with such a wide angle 20mm lens, color and contrast seem to be accurate. Focus accuracy and speed are pretty good.

Serious back focusing issues, was out by about 20 cm from 1m away ! very disappointed as im not sure the calibration dock could have fixed such a serious problem. think sigma need to tighten up on quality control

The lens has good contrast and is sharp as a razor. Good in low light. AF is good, the same as the 35mm 1.4 art. Hoping they can come up with a way to put a filter on it. Would like to use my neutral density with this.

Great Picture Quality

Heavy