Sigma Contemporary 45mm f/2.8 DG DN 45mm

The Sigma 45mm f/2.8 DG DN Contemporary nails build quality at the 91st percentile and AF at the 86th, all in a 215g weather-sealed body. But the optical score sits at a mediocre 47th percentile, and it's soft until f/5.6. Great for street shooters who value feel, rough for anyone chasing sharpness.

The AF system is a genuine highlight. That stepping motor ranks in the 86th percentile, and in practice it's snappy and quiet enough for both stills and casual video. The 1:4 max magnification at a 240mm minimum focus distance gives you close-up flexibility that most 45mm primes don't offer, landing in the 80th percentile for macro. You can get surprisingly tight on details without swapping lenses.

Optically, things get more complicated. The 8 elements in 7 groups with Super Multi-Layer Coating sound fine on paper, but the 47th percentile optical score tells the real story. Wide open at f/2.8, this lens is soft, and a couple of owners note it doesn't sharpen up until around f/5.6. The 7-blade diaphragm produces bokeh that's above average, but if you're buying a prime for edge-to-edge sharpness, this isn't the one. The aperture itself ranks in the 85th percentile, which is more about the f/2.8 to f/22 range being useful than it being fast.

Against the Sony E 18-135mm f/3.5-5.6 OSS, the Sigma gives up stabilization and focal range but wins on build quality and aperture control. The Sony zoom is more versatile, but it's also slower and less fun to shoot. The Nikon NIKKOR Z 17-28mm f/2.8 is a different beast entirely, a wide zoom with constant aperture that beats the Sigma on versatility but costs more and weighs more. The Viltrox AF 13mm F1.4 XF is faster and wider, but it's APS-C only, so full-frame shooters are out of luck. The Tamron 28-300mm f/4-7.1 is a superzoom that covers everything but sacrifices the prime lens character and build quality the Sigma brings. If you want one lens that feels premium and shoots street well, the Sigma makes sense. If you need sharpness across the frame or any kind of stabilization, look elsewhere.

Pricing is all over the place depending on where you shop. In the US, listings range from USD 387 to USD 619 across 19 vendors, which is a USD 232 spread for the exact same lens. That's not a small difference, and it means the value proposition changes completely depending on which store_name you land on. At the low end, you're getting a beautifully built, weather-sealed prime with fast AF for under USD 400. At the high end, you're paying premium money for a lens with a 47th percentile optical score, and that's a harder sell. European buyers see a tighter EUR 50 spread between EUR 499 and EUR 549, so the deal hunting matters less there. Canadian pricing swings wildly from CAD 399 to CAD 848, so shop carefully.

The Sigma 45mm f/2.8 DG DN Contemporary is a lens that wins on feel before you even look at a chart. At 215g with full-frame coverage and weather sealing, it's the kind of glass you forget is on your camera until you check the files. Our database puts its build quality in the 91st percentile, which tracks with the all-metal barrel and that satisfying aperture ring. But the optical score lands at a middling 47th percentile, and that gap between how it feels and how it resolves is the whole story here.

Street shooters get the best version of this lens. It scores 82.4 for street work, where the slightly wide 45mm focal length and quick stepping motor AF matter more than corner sharpness. Portrait use comes in at 78, helped by bokeh that sits in the 83rd percentile. Outdoor scenery is the weak spot at 53.6, and that's where the f/2.8 max aperture and soft wide-open performance start to show.

Skip this if you shoot outdoor scenery or need edge-to-edge sharpness. The outdoor scenery score of 53.6 is the weakest area by a wide margin, and the 47th percentile optical performance means fine detail just isn't this lens's strength. Also skip it if you're on a first-gen Sony a7 body, given the reported AF failures. And if you need stabilization, the 36th percentile ranking there means you'll be relying entirely on your camera body, which older Sony bodies don't have.

The Sigma 45mm f/2.8 DG DN Contemporary is a lens you buy for how it feels and how it focuses, not for how it resolves fine detail. The 91st percentile build quality and 86th percentile AF are legitimately great, and at 215g it's a joy to carry. But the 47th percentile optical score is a real limitation, and the outdoor scenery score of 53.6 confirms this isn't a do-everything prime. If you shoot street or environmental portraits and value handling over pixel-peeping sharpness, this lens earns its place. If you're printing large or cropping heavily, the softness wide open will frustrate you.