Although I've already shared some thoughts on the new Sigma 20mm F2 DG DG | C lens on the Sigma America blog, I wanted to share a few new images and thoughts here.

There's an adage in photography that "gear doesn't make the photo" and while this is mostly, if not, entirely true. Gear certainly plays a larger part in astrophotography than in most other genres of photography. A great photographer with a lens that performs poorly won't be able to do much about those short comings. The image itself may still be beautiful, but the optical deficiencies of the lens would be hard to hide. 

Finding the right lens for astrophotography most often means finding a sharp lens with a fast aperture to let as much light in as possible. For letting the most light in possible, a prime or fixed focal length lens is most often the best choice. The faster aperture of these lenses may not seem like a big deal, (f2.8 v f2 v 1.4) but are often the difference between a dark silhouetted foreground and one more detailed. The drawback of these lenses at times comes from their larger size and weight. 

With all that said, the words travel and astrophotography gear rarely go together.  Which is one of the key reasons I've been so excited about this new 20mm lens from Sigma. Coming in at just 370 grams, it's about half the weight of some of the counterparts that share the same focal length. That's a pretty big difference in weight. 

That said, let's take a look at a few of my early and most recent images with this new lens.

First Milky Way core of the 2022 - New Jersey

Sea caves and sea stacks - California

East Point Lighthouse - New Jersey

Quality from Corner to Corner

With every lens, the sharpest area of a photo will always be the center of the frame. As you work your way out from there, it's not uncommon for the pixel peeping eye to notice varying degrees of that sharpness dropping off. In addition to the center of a lens being the sharpest area, lenses will also generally perform best at an aperture between f/8 and f/11.

You can see how the combination of these two things can be a true challenge when it comes to astrophotography. Few other genres of photography have such distinguishable objects in what is commonly the least sharp spot of any lens, the extreme corners. Add in the fact that astrophotography is generally shot wide or very close to wide open and these areas can easily be a minor eye sore on an otherwise beautiful image. In many situations, the stars in the corner of the frame will look bloated, appear to have "wings" or appear to be slightly stretched in comparison to stars closer to the center of the frame.

With all that in mind, the results from the Sigma 20mm f2 DG DN | C do all the talking needed. The above image shows a 100% crop look at the top corner of an image shot at f/2.  It doesn't get much better than that.            

A Clear Choice

As someone who has shot exclusively with ART series lenses for nearly 8 years, one of the things that surprised me the most was the build quality of this Contemporary series lens. As nice as the lens looks in photos, the all metal construction feels even better in person.

Between the quality, the incredibly small size, and a price point of just 699.00, I think this lens is going to end up being a go-to for a wide range of photographers.

Whether you're an avid hiker, a business traveler looking for something extremely capable and easy to pack, or someone looking for their first lens that can take amazing quality astro photos, while still being versatile enough for other genres, the 20mm F2 DG DN | C is the answer to a lot of questions.

This lens is available now for both E-mount and L-mount cameras.


You can check out galleries of astro images shot with various Sigma lens via the link below:


View astrophotography image galleries shot with each Sigma lens here

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