Leica Summilux-M 35mm f/1.4 (v1)

It is two in the morning, the bar is closing, and you are shooting at f/1.4 because that is the only way light is reaching the film at all. This is the lens for that. The first Summilux-M 35mm came out in 1961, and the non-aspherical Mandler formula soldiered on across two versions into the mid-1990s, the early Steel Rim from 1961 to 1966 and the long-running second version that carried the same seven-element design from 1967 all the way to 1995. An aspherical redesign arrived in the early 1990s and eventually replaced the old glass, so do not picture one untouched recipe for thirty-odd years. Picture one optical idea that simply refused to die, and people still hunt the early examples down for how they behave when you open them all the way up.

Wide open it is soft, and that is the point. There is a glow around highlights, a low-contrast veil that smears specular points into halos, and corners that fall apart into blur. Shoot a streetlight at f/1.4 and it blooms. Some photographers chase exactly this, because the rendering is romantic in a way the later aspherical glass, optimized to resolve a chart cleanly, simply will not give you. Stop down to f/2.8 or f/4 and it pulls itself together. Contrast climbs, the center gets genuinely sharp, and by f/5.6 it is a clean, capable 35 that holds its own in daylight. You are really buying two lenses sharing one barrel, and which one you get is set by the aperture ring.

The look has a name among collectors. The earliest run is the "Steel Rim," after the stainless ring around the front, and that scarce early run ended in 1966 and now trades well into Leica-collector territory rather than working-lens prices. The later non-aspherical version, the one that kept the same formula going to 1995, is the four-figure used buy most people actually shoot. What you are paying for is character, not resolution. Anyone who wants clinical 35mm sharpness buys the Summilux-M ASPH or the Summicron 35 and never thinks about this lens again. Anyone who wants the look of a streetlight blooming over wet pavement keeps it.

It earned its keep as a reportage and street lens through the back half of the twentieth century, when a 35 on a small rangefinder body was how you worked a room without anyone noticing. Bokeh is restless rather than creamy, with out-of-focus edges that can outline a branch instead of melting it. Flare control is what a 1960s coating gives you, so point a bright source at it and expect veiling and the odd artifact. Use the hood. Field curvature means the corners and the center do not always sit on the same plane of focus, which is one more reason a flat test chart tells you nothing useful about this lens.

The honest weakness is that the mood is not always the one your scene wants. In flat overcast light at f/1.4 the low contrast just reads as muddy, not dreamy, and you end up stopping down to recover bite you would rather have kept open. There is no shutter in it, so exposure lives entirely on the body. When you are wide open in the dark, meter for the shadows you actually care about and let the highlights go where they will. In Zone Light Meter, place your reading on a low zone and the f/1.4 setting follows, since that glow is a feature here, not an error to correct. The 41mm filter thread is an oddball size, so track down the right ND or yellow filter before you need it, not after.