Sigma art lens6/19/2023 You can see that the focus on these wild “Black-eyed Susans” is nailed. The Sigma version employed here is one of the best, however, with silent, extremely fast autofocus that delivers good accuracy. There is a stepping focus motor (STM), though not all STM motors are created equally. Sigma has settled on a formula for autofocus on their DN lenses that seems to work. Sigma is clearly making a concerted effort with many of these new DN lenses to reduce the size and weight relative to their DSLR ART series lenses, and the fact that they are managing to do while improving the performance is worthy of celebration. They are well built, feature rich, and generally a joy to use in the field. By the time you’ve hit the minimum focus limit with the 20mm DN ART, you’ll pretty much also be hitting your subject with the front of the lens!Īll in all, the build quality and feature list of both of these new Sigma wide angle primes is pretty much top notch. It also means that during video capture you won’t have to worry about exceeding the focus limitation and getting too close to your subject. The 20mm F1.4 DN looks hefty but nowhere near overwhelming on the camera. Weight clocks in at 630g (22.2oz), which is a pretty huge weight savings when you consider that the mirrorless versions of the previous lens clocked in at over 1 kilogram. The physical dimensions are right under 88mm in diameter (3.5”) and 113.2mm in length (4.5”). It does have a wider front element (and thus filter thread at the front of the lens), but Sigma notes that the lens barrel and size is otherwise roughly the same as the 35mm F1.4 DN ART. Sigma 20DN ART Build and HandlingĪs noted in the intro, the Sigma 20DN ART is not a small lens, but it is certainly a smaller lens than its predecessor. *The tests and most of the photos that I share as a part of my review cycle have been done with the Sony a7IV along with the Sony Alpha 1 which will serve as my benchmark camera for the foreseeable future ( my review here ). As always, this is a completely independent review. Thanks to Gentec (Sigma’s Canadian Distributor) for sending me a pre-release review loaner of this lens. Sigma 20mm F1.4 DG DN ART Review: Optical Brilliance | DAįollow Me YouTube | Patreon | Instagram | Facebook | DA Merchandise | Flickr | 500px In short, Sigma has improved on something that other lens makers haven’t even attempted yet! That’s impressive when you consider that this is the first 20mm F1.4 lens for full frame mirrorless and that it joins the previous Sigma lens as the only 20mm F1.4 full frame lens, period. The new DN lens is not what you would call a small lens, but it is considerably smaller and lighter than the previous edition. The new 20DN ART is 30+mm shorter and weighs over 400g less. That lens is a bit compromised as a byproduct, as it is A) bigger and heavier than it needs to be (about 18mm longer and 150g heavier than the DSLR version) and B) has an adapted autofocus system which works fairly well but not quite as well as a lens natively designed for mirrorless autofocus. DN is the designation Sigma uses for its purpose designed mirrorless lenses, so, while there is an existing 20mm F1.4 ART lens for Sony E and Leica L, that lens is a “ported” DSLR lens (essentially with a built in adapter to allow autofocus to work properly and to move the optical path forward for proper focus on a camera without a mirror.
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