Voigtlander Nokton 50mm f/1.5 Aspherical (LTM)

Available light, after sundown, hand-held, with a body that has no meter coupling and no autofocus to bail you out. Open this to f/1.5 and you are pulling better than two stops more than the f/3.5 Elmars and Industars most screw-mount shooters actually carry, which is the gap between a frame you can hand-hold and a tripod you left at home.

Cosina built it in 1999 under the revived Voigtlander name, alongside the Bessa-L and the screw-mount lens line that dragged M39 back from the dead. The Nokton badge comes from the 1950s f/1.5 originals, but optically this is a different animal: a modern double-Gauss with a molded aspherical surface, and the asphere earns its keep. Wide open the center is sharp in a way the vintage Noktons never managed, and contrast holds instead of dissolving into that soft milky veil. Most of the old glamour glow is gone. In its place you get a fast fifty you can genuinely shoot at f/1.5, not one you stop down to f/2.8 just to make it behave.

By f/4 it is sharp corner to corner and stays that way through f/11. The bokeh is where it gets interesting. Backgrounds go smooth and round in the middle, then the edges start to misbehave, with some swirl and a faint outlining on hard speculars wide open. For environmental portraits and night street work that edge character is part of the draw; other shooters find it busy and back off. Flare is held better than the vintage glass, though a bright source just outside the frame can still drop contrast across your shadows. Keep the hood on.

It rides on Bessa bodies, on screw-mount Leicas through the body's own meter, and on any M-mount body with a five-dollar LTM-to-M adapter. The 49mm thread is roomy for a fast fifty and takes an ND or polarizer without vignetting, which you will want when you shoot wide open in daylight and run out of top shutter speed. People cross-shop it against the Leica Summilux for a fraction of the money, and against Cosina's own later M-mount Noktons. Its real flaw is chromatic aberration wide open: purple fringing shows up on hard high-contrast edges in harsh light, and it only really settles down once you stop the lens down a bit.

A word on exposure. On an uncoupled or meterless body you are setting everything by hand, and at f/1.5 in a dim room your reading sits at the bottom of the scale, where a third of a stop tips the whole frame. Meter the shadow you mean to keep, place it on a chosen zone in Zone Light Meter, and let the app sort out the rest. The wide aperture only buys you anything when the exposure under it holds.