Leica Noctilux 50mm f/1.2 (1966)

Wide open, this lens does something almost no other fifty from the 1960s could do: it carries more bite in the center than at the edges while everything past the plane of focus dissolves into a busy, swirling wash of light. That dreamy, glowing look at f/1.2 is the whole point. It was the first Leica lens, and one of the first production lenses anywhere, to use hand-ground aspherical elements, which is how Leitz's optical team in Wetzlar tamed the spherical aberration that would otherwise smear a fifty this fast into mush. The asphericals are also why so few were made and why a clean one now costs as much as a used car.

The rendering is the reason people chase it, even though the later f/1 lays down a smoother field. Out-of-focus highlights come back as bright discs with a defined outline, and the nervous, swirling background it builds is exactly the look this lens is known for, distinct from the creamier f/1. Contrast wide open is lower than a modern Summilux, which reads as a gentle glow on skin and on specular sources at night. Color is neutral and slightly warm, the classic vintage Leica rendering before the high-contrast aspherical Summiluxes arrived. Stop down to f/4 and it sharpens up and behaves like a very good normal lens, but nobody buys this to shoot it at f/4.

It is a low-light and available-darkness tool, and not much else. Reportage shooters and street photographers who lived on the M body in the late 1960s reached for it when the only other option was pushing film two stops. Indoors, in bars, on stage, at dusk, the f/1.2 buys you a shutter speed nothing else in the M lineup of that era could match. It is not a landscape lens and it is not really a daylight lens; in bright sun the f/16 minimum aperture and a 1/1000 top body speed leave you reaching for ND or fast film you do not want.

The honest weakness is field curvature and edge performance wide open. The corners at f/1.2 are soft and the field bows, so a flat subject filling the frame will go fuzzy toward the edges while the center stays crisp. That is fine for a face on the rule-of-thirds line and frustrating for anything you want flat and even across the frame. Vignetting at full aperture is also heavy.

Today it sits in grail territory, cross-shopped against the Canon 50mm f/0.95, a Canon-7 rangefinder lens often converted to Leica M, for people who want the speed without the Leica tax, and against the modern Noctilux f/0.95 ASPH for people who want clinical sharpness instead of this lens's older, gentler signature. Most buyers are collectors or shooters who specifically want the vintage glow. When you do use it at night, meter wide open in Zone Light Meter and spot the few bright sources you actually want to hold. With this much falloff you are placing exposure on a single face against a dark frame, not balancing an even field, so read the highlight that matters and accept that the shadows fall where they fall. The filter setup is unusual: the original takes Series filters through its clip-on hood rather than a normal screw-in front thread, so plan ahead if you want a clear protective filter on the front.