Leica Elmarit-M 24mm f/2.8 ASPH

Clip the external bright-line finder into the shoe, screw this 24mm onto an M6, and you have a street rig that nobody reads as a camera until the shutter has already fired. That is the natural habitat for the Elmarit-M 24mm f/2.8 ASPH. It takes in a whole stretch of pavement, holds f/2.8 when the light goes, and the barrel stays short enough to disappear in the hand. Leica built it from 1996 to 2011, and it carried the aspherical era of the M wide-angle range.

The rendering is the reason people put up with the rest. Reviewers generally find it sharp across most of the frame wide open, with the corners cleaning up as you stop down past f/5.6 and settling by f/8. The aspherical element does its real work on distortion and field curvature, which is exactly where 24mm designs tend to come apart. Distortion is well controlled for the focal length, so straight lines near the edges hold their shape. Contrast is high in the classic modern-Leica way, blacks sit deep, and color stays saturated. Flare control is good but not bulletproof, so a bright source just outside the frame can throw a faint veil. The dedicated hood is worth keeping on.

At 24mm and f/2.8 nobody buys this for bokeh, and it makes no pretense otherwise. Stopped down it holds enormous depth of field, which is the whole point for zone-focusing on the street. Set it to f/8 and three meters and you barely touch the focus tab again all day.

The real cost is the framing. The M rangefinder patch only goes so wide, so a true 24mm needs that accessory finder, and you compose in one window while focusing in another. It slows you down, and in fast reportage the auxiliary finder is one more small thing to lose in a bag. Plenty of shooters skip it and just learn the angle of view cold.

Today this lens lives in the used-Leica price tier where it cross-shops against its own successors and against the Voigtlander 25mm and 28mm Color-Skopars, which deliver a lot of the optical quality for a fraction of the money. People still pay the Leica premium for the build, the compact barrel, the 55mm filter thread that takes ordinary screw-in filters, and a rendering signature the cheaper glass gets close to without fully matching.

One metering note. Shooting wide open in failing light, meter for the shadows you actually care about and let the highlights run, because a 24mm at this aperture still has enough depth of field that your real decision is tonal, not focal. Drop your shadow reading into Zone Light Meter, place it on Zone III or IV, and the app gives you the shutter speed before the streetlights take over. If you are stacking an ND or a grad on that 55mm thread for daylight landscape work, factor the filter into the reading the same way.