Sigma EX DC 30mm f/1.4

The Sigma 30mm f/1.4 DC DN is a fast, sharp prime that delivers exceptional bokeh and low-light performance for APS-C shooters. It's ranked in the 97th percentile for bokeh and 96th for aperture, and owners consistently praise its value. Autofocus can be inconsistent at distance, and corners are soft wide open, but for street and portrait work, it's hard to beat. Prices range from $253 to $864 USD, so shop around and grab it at the low end.

Sharpness is the headline here, and it's not marketing fluff. The optical design packs 9 elements in 7 groups, including 2 aspherical elements and 5 ED elements, plus Sigma's Super Multi-Layer Coating. That's a lot of glass engineering for a lens this small. In practice, owners consistently report that center sharpness is excellent even wide open at f/1.4, which is rare for a budget-friendly prime. The bokeh quality sits at the 97th percentile in our database, and the 9-blade diaphragm helps keep out-of-focus highlights looking round and smooth rather than jagged.

But the corners tell a different story. Wide open, you'll see softness at the edges, and vignetting is noticeable. Chromatic aberration also shows up in high-contrast scenes, especially before you stop down. The optical score lands at the 78th percentile, which is solid but not class-leading. For portraits and street work, none of this matters much, since your subject is usually centered and the vignette can actually add character. For landscape shooters, though, this is a weak spot. Our data puts landscape performance at 62.5 out of 100, the lowest category for this lens. If you're shooting flat fields or architecture, you'll want to stop down to f/4 or f/5.6 to clean things up.

The Sigma 30mm f/1.4 DC DN doesn't compete directly with zooms like the Tamron 28-300mm f/4-7.1 or the Nikon Z 24-200mm f/4-6.3, but those lenses show up in our competitor list because they're what many APS-C shooters consider instead. The trade-off is simple: those zooms give you flexibility, but they can't touch the Sigma's f/1.4 aperture or bokeh quality. The Tamron starts at f/4 and gets slower as you zoom, while the Sigma holds f/1.4 the whole time. For low light and subject isolation, there's no contest.

Against other primes, the Sigma holds its own. The Viltrox Air AF 14mm f/4 is wider and cheaper, but it's two stops slower and doesn't have the same reputation for sharpness. The Panasonic Leica DG Vario-Elmarit 12-35mm is a zoom with a constant f/2.8, which is more versatile but still a full stop slower than the Sigma. If you need one lens that does everything, a zoom makes sense. If you want the best image quality and low-light performance for the price, the Sigma is the clear pick. Just know that you're giving up stabilization and zoom range to get it.

Here's where things get interesting. The USD price spread across 90 listings runs from $253 to $864, which is a massive range for the same lens. That's a $611 gap, and it tells you that shopping around matters more than usual. The lower end of that range is an absolute steal for what you get. The higher end? You're paying a premium for availability or a specific mount, and at that point you should seriously consider alternatives. In CAD, the spread is tighter but still notable: $350 to $585 across 4 listings.

For the money, this lens delivers exceptional value. The user sentiment score sits at 82 out of 100, and value for money is one of the top recurring themes in reviews. Owners consistently say this lens punches way above its price class, especially when compared to first-party options. The catch is that you need to shop carefully. If you can find it near the $253 mark, it's one of the best deals in APS-C photography. If you're looking at $800+, you're in used full-frame prime territory, and the calculus changes completely.

The Sigma 30mm f/1.4 DC DN Contemporary is one of those lenses that makes you wonder why you'd ever bother with a kit zoom again. It's a fast prime built for APS-C mirrorless shooters, and on paper it hits the sweet spot: a 30mm focal length that acts like a 45mm full-frame equivalent, a bright f/1.4 aperture, and a compact body that won't make your camera bag feel like a gym membership. We've seen this lens pop up across a bunch of mounts, from Sony E to Canon EF-M to Nikon Z, and it's been a quiet favorite for years.

Who's this for? Street photographers, portrait shooters, and anyone who wants shallow depth of field without selling a kidney. Our database ranks it in the 91st percentile for street work and 87th for portraits, which tells you exactly where it shines. The f/1.4 aperture sits in the 96th percentile among primes, meaning it gathers a ton of light and can blur backgrounds into creamy oblivion. Bokeh quality lands even higher, at the 97th percentile, so the out-of-focus areas look genuinely pleasing, not just blurry.

But here's the thing: this lens isn't perfect, and the user sentiment data backs that up. Owners love the sharpness and value, but autofocus consistency comes up as a recurring gripe. Some copies hunt at distance or get noisy in video. We'll dig into all of that below, because if you're spending real money on a prime, you deserve to know what you're getting into.

If you shoot landscapes or architecture, this lens will frustrate you. The soft corners at f/1.4, noticeable vignetting, and chromatic aberration wide open are exactly the things that ruin flat-field shots. Our data puts landscape performance at 62.5 out of 100, the weakest category for this lens. You'd need to stop down to f/4 or f/5.6 to get clean edges, and at that point you're giving up the very aperture you paid for. Look at a stabilized zoom or a prime with better edge-to-edge performance instead.

Also skip this if you need reliable autofocus at distance. The AF performance sits at the 54th percentile, which is dead average, and user reports of hunting and inconsistency at longer distances are common. Wildlife, sports, or event shooters who need to lock focus quickly on moving subjects will find this lens frustrating. And if you're on a full-frame camera, this lens simply isn't designed for you. The APS-C coverage means you'd be cropping away most of your sensor. For those use cases, a first-party prime with better AF or a stabilized zoom is the smarter buy.

For street photographers and portrait shooters on APS-C, this lens is an easy recommendation. The combination of f/1.4, beautiful bokeh, and compact size is hard to beat at this price. If you can find it under $300 USD, buy it without hesitation. The sharpness alone justifies the cost, and the low-light capability means you can leave the flash at home. Video shooters will appreciate the smooth aperture and compact form factor, though the lack of stabilization means you'll want a gimbal or a camera with IBIS.

But this isn't the lens for everyone. If you shoot landscapes or architecture, the soft corners and vignetting wide open will frustrate you. If you need reliable autofocus at distance, the mixed AF reports are a real concern. And if you're on a full-frame camera, this lens isn't designed for you anyway. For those use cases, look at a stabilized zoom or a first-party prime with better AF consistency. The Sigma 30mm f/1.4 is a specialist, and it's brilliant at what it specializes in. Just don't expect it to be a jack of all trades.