Leica 21mm Summilux-M f/1.4 Asph review – rare and beautiful, but a serious investment

The Leica 21mm Summilux-M f/1.4 ASPH is not just another wide-angle lens in the M system; it is one of Leica’s most ambitious pieces of glass. Combining an ultra-wide 21mm field of view with a fast f/1.4 aperture, it offers a rare mix of dramatic perspective, low-light capability, and shallow depth of field that few lenses of this type can match.

On paper, it is a specialist lens, but in use it quickly becomes something far more versatile, opening up creative possibilities for documentary work, travel, interiors, environmental portraits, and available-light photography.

For Leica M photographers, the 21mm Summilux sits in a unique position. It is wider than the classic 28mm and 35mm focal lengths many rangefinder users gravitate toward, yet it retains the character and speed expected from the Summilux name.

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It is a lens designed for photographers who want to step closer, include more of the world around their subject, and create images with a sense of space, atmosphere, and depth. In this review, I take a closer look at how it handles, how it performs, and whether this remarkable wide-angle Summilux still justifies its place in the Leica lineup.

Leica 21mm Summilux-M f/1.4 Asph: Specifications

Mount: Leica M-mount
Full frame: Yes
Autofocus: No
Image stabilization: No
Angle of view: 92°
Minimum aperture: f/1.4
Minimum focusing distance: 2.3 ft / 70cm
Maximum reproduction ratio: 1:29
Dimensions: 2.7 x 2.6 in / 69.5 x 66mm
Weight: 1.3 lb / 580g

Leica 21mm Summilux-M f/1.4 Asph: Build and Handling

The Leica 21mm Summilux-M f/1.4 ASPH is everything you would expect from a premium Leica M lens. It is solid, beautifully finished and has the kind of engineering feel that reminds you exactly why Leica lenses are held in such high regard. It feels like a proper piece of photographic equipment rather than just another lens, and there is a real sense that this is something designed to be used, treasured and kept for decades.

In the hand, the lens feels reassuringly substantial without becoming unmanageable. The focus ring is wonderfully smooth, with a short and precise focus throw that makes manual focusing feel intuitive and rewarding. The aperture ring is equally satisfying, clicking into place with a snappy, mechanical confidence. Everything about the main construction of this lens feels considered, premium and deeply sophisticated.

However, there are a few handling points worth mentioning. Because this is a 21mm lens, you do not get automatic frameline detection in the same way you would when mounting a 28mm, 35mm or 50mm lens on a Leica M camera. The widest framelines shown by modern Leica rangefinders are 28mm, which means you are forced to compose in a different way.

On a modern digital Leica M body, that means using live view on the rear screen or adding a Visoflex electronic viewfinder, which shows the entire image the lens sees and helps with critical focusing.

If you are using a Leica M without live view, whether digital or film, you will need the separately sold Leica 21mm external optical viewfinder to properly see what you are taking. Of course, if you are using this lens on the modern Leica M EV1, then this is not an issue at all, as the built-in EVF allows you to see the full 21mm field of view without any additional accessories.

Having reviewed this lens on the Leica M11-P, I found myself opting for live view with red focus peaking, which made the whole process of shooting with this lens far more accurate and enjoyable. It is not quite the pure rangefinder experience some Leica users may want, but with a 21mm lens this wide, it does make practical sense.

One small frustration is the lack of a focusing tab. The focus action itself is superb, but a thumb tab would have made quick focusing feel even more instinctive, especially for street and documentary work.

There is also the lens cap. While correct for the period in which this lens was produced, the lightweight plastic Leica-branded cover does not really match the premium quality of the lens itself. This is admittedly being very picky, but when you are spending this much money on a lens, you do want the accessories to feel just as special.

Leica 21mm Summilux-M f/1.4 Asph: Performance

The performance of the Leica 21mm Summilux-M f/1.4 ASPH is fantastic. This is a lens that oozes quality, not just in how it is built, but in the images it produces. When paired with a modern 60MP Leica M body such as the M11-P, the level of detail, sharpness and rendering is truly impressive.

A 21mm lens is already a dramatic focal length, giving you a wide, immersive view of the world, but the Summilux adds something extra. The f/1.4 aperture gives this lens a character that is not commonly found in ultra-wide M lenses. It allows you to work in low light, separate subjects in a subtle but beautiful way, and create images that have both scale and atmosphere.

The image quality is excellent across real-world use. Detail is crisp, contrast is strong, and colors have that unmistakable Leica richness. It is the sort of lens that rewards careful composition, but it can also be used in a more instinctive way once you get used to the 21mm field of view. Architecture, interiors, environmental portraits, travel, documentary and street photography all suit this lens brilliantly.

However, one thing that is slightly annoying is the minimum focusing distance of 0.7 meters. For a lens this wide, there are times when you naturally want to get closer to your subject, especially when trying to create a more dramatic foreground or intimate perspective.

The 0.7m limit can be a challenge in some shooting situations, and it is one of the few areas where the lens feels slightly restricted compared with more modern close-focusing designs.

That said, when you work within its limits, the results are exceptional. The Leica 21mm Summilux-M f/1.4 ASPH is not simply sharp for the sake of being sharp. It has character, presence and a beautiful way of drawing a scene. The files it produces feel rich and full of life, especially when used with the latest high-resolution Leica M sensors.

Leica 21mm Summilux-M f/1.4 Asph: Sample photos

Leica 21mm Summilux-M f/1.4 Asph: Lab results

We run a range of lab tests under controlled conditions, using the Imatest Master testing suite. Photos of test charts are taken across the range of apertures and zooms (where available), then analyzed for sharpness, distortion, and chromatic aberrations.

We use Imatest SFR (spatial frequency response) charts and analysis software to plot lens resolution at the center of the image frame, corners, and mid-point distances, across the range of aperture settings and, with zoom lenses, at four different focal lengths. The tests also measure distortion and color fringing (chromatic aberration).

Sharpness:

Center sharpness wide open is good, but not particularly special - you'll have to stop down to f/4 for a noticeable improvement, but even then we'd expect better performance from a prime lens like this. Corner sharpness is downright disappointing through most of the aperture range, only becoming respectable at f/11.

For some reason our lab data test shots had aperture f/stop values recorded in EXIF data which didn't match the lens's physical aperture settings. Our f/1.4 shots were also recorded with narrower aperture values, hence the lack of f/1.4 data in our test results.

Fringing:

Fringing in the center and mid region of frame is negligible, however it is noticeable in the corners of frame throughout the aperture range.

Distortion: -0.93

There's slight barrel distortion, but it shouldn't be easily visible in real-world shooting.

Leica 21mm Summilux-M f/1.4 ASPH Verdict

The Leica 21mm Summilux-M f/1.4 ASPH is one of those dream lenses. It is the kind of lens you buy once, use with pride and very possibly keep for the rest of your life. It is beautifully made, truly fantastic to use and capable of producing images that feel every bit as special as the lens itself.

Yes, it is incredibly expensive. At around $9,840 / £7,500, this is a serious investment, even by Leica standards. It also comes with a few practical compromises, including the lack of 21mm framelines in the rangefinder, the need for live view, Visoflex or an external finder, and the 0.7m minimum focusing distance.

But none of that takes away from what this lens is. If 21mm is your desired focal length, and you want one of the finest ultra-wide Leica M lenses ever made, then the Summilux-M 21mm f/1.4 ASPH is a significant investment into your photography that will be worth every penny of your hard-earned cash. It is expensive, rare and slightly demanding, but it is also magnificent.

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