Is the Lumix S 20mm f/2.5 Worth $498 if You Already Own the 20-60mm?

Panasonic's new Lumix S 20mm f/2.5 is a tiny full frame prime for L-mount bodies, and it shares its focal length with the kit zoom that ships with a lot of Lumix cameras. That overlap, plus a $498 price, puts real pressure on what a dedicated 20mm prime has to deliver.

A lens can be easy to love and easy to criticize at the same time. Pav SZ has shot hundreds of frames with the Lumix S 20mm f/2.5 on the Lumix S5IIX, the Lumix S9, and the Lumix S1II, and his results swing between two extremes. In ordinary light, it acts like a modern Lumix lens, with quick autofocus, plenty of contrast, and pleasing color. Point it toward a strong light source, and large areas of flare spread across the frame while contrast falls away around them. Chromatic aberration can get heavy on high-contrast edges, the corners soften at f/2.5, and close-up shots wide open sometimes pick up a glow that looks more like a budget lens than a new Panasonic prime. Even so, he keeps reaching for it, and he spends the video working out why.

Size is a big part of the answer. At 142 g, the lens doesn't turn an S5IIX into a pocket camera, but it changes how the whole kit feels in your hand and on your shoulder. A small lens also draws less attention on the street. It's weather-sealed, so a sudden drizzle doesn't send the camera back into the bag. It focuses down to 18 cm, and Pav SZ ended up taking more close-ups with it than anything else, using the wide view to keep the environment around a subject without the stretched look of a 14mm or 16mm lens. Physically, it's nearly a twin of the Lumix S 40mm f/2, and he likes this one considerably more despite its bigger optical problems.

Plenty of people now pay to add the kind of imperfection this lens produces on its own. Diffusion filters like the Tiffen Black Pro-Mist became popular with stills and video shooters because they soften highlights and add bloom, and adapted vintage glass sells largely on flare and glow. A lens that renders clean, contrasty images in flat light and turns loose against the sun gives you both looks in one small package, as long as you learn where the line sits. Shade the front element with your hand, or shift a light source just outside the frame, and you get most of the clean rendering back. Put the sun in a corner or behind a branch, and you lean into the flare deliberately. Stopping down tightens the corners and reduces the glow on close subjects, so f/2.5 becomes a choice you make for separation rather than a default. The starbursts are distinctive too: seven strong points with seven smaller ones between them, a pattern you'll start to recognize across a set of images. Wide primes reward this kind of intent. At 20mm, you're close to your subject and often including a bright sky, so how a lens handles light decides more of your frames than it would at 50mm.

The bigger question for many Lumix owners is the Lumix S 20-60mm f/3.5-5.6 already sitting in the bag. Pav SZ put the two side by side, and at 20mm, the sharpness gap between them is smaller than you might expect. The prime gives you f/2.5 against the zoom's f/3.5 at that focal length. The zoom, surprisingly, focuses much closer, which takes some of the shine off the prime's 18 cm figure. On video, the prime shows a little focus breathing if you go looking for it, and stabilization didn't produce the corner wobble he expected from a wide lens. He also weighs the $498 price, with cheaper 20mm autofocus lenses already available for L-mount.

Pav's answer on whether he'd buy one is in the video above.