Voigtländer Nokton 50mm f/1.1

Voigtländer Nokton 50mm f/1.1

When Cosina released this lens it gave Leica M photographers a genuinely fast 50mm at a fraction of the cost of Leica's own f/1.0 Noctilux. It was the first of Cosina's super fast rangefinder fifties, built around an all spherical optical formula of seven elements in six groups, broadly in the spirit of the classic Noctilux it was meant to undercut [1][2]. Reviewers consistently frame it as the budget route to a similar undercorrected, fast-aperture look, and on the used market it has often traded well below alternatives, which keeps it in demand among photographers chasing character rather than clinical correction.

The lens carries Cosina's familiar build: anodised matte black aluminium with engraved, paint-filled markings and a small red index dot for mounting. It is a substantial 50mm at 69 mm long and 57 mm in diameter, weighing 428 g, and it takes 58 mm filters. The focus ring has a long, evenly damped throw that makes precise focusing straightforward, while the aperture ring runs in half-stop clicks to f/16. It is rangefinder coupled and was made in Japan with single-coated glass. Because it is physically large, it produces noticeable rangefinder blockage in the finder, though reviewers note the rangefinder patch itself stays usable. The lens is not six-bit coded, and it adapts readily to mirrorless bodies for those who prefer to focus on the sensor.

The Nokton 50mm f/1.1 was produced in black only. It sits as the earliest member of Cosina's fast 50mm Nokton family, later joined by an f/1.2 aspherical design and an f/1.0 aspherical flagship, both of which use newer diaphragm and floating-element technology that this older all spherical lens does not. There are no widely documented factory special editions of this particular model.

Optical qualities

Rendering The lens has a deliberately classic, undercorrected signature. Wide open it is lower in contrast with visible spherical aberration, and stopping down progressively cleans up the image; reviewers describe it as a lens bought for its look rather than for clinical performance.

Sharpness Centre sharpness is reasonable at portrait distances even from f/1.1, but performance falls off toward the edges and corners, which need considerable stopping down to tidy up. The midframe benefits from closing to around f/4, and the extreme corners only become strong at small apertures. Ken Rockwell's assessment is notably harsher, calling the lens soft wide open and softer than rival fifties even stopped down.

Contrast and color Contrast and resolution are at their best at mid distances, and users frequently single out the lens for pleasing contrast and color compared with some cheaper rivals.

Bokeh and transitions Out-of-focus rendering is "classic" rather than smooth. Out-of-focus highlights show pronounced outlining, and optical vignetting deforms light circles toward the frame edges, producing busy, sometimes nervous backgrounds that some photographers seek out for portrait and night work.

Flare resistance A strong point light in the frame can throw substantial artefacts at maximum aperture, some of which persist when stopped down. The supplied hood offers only modest protection against veiling flare from sources just outside the frame.

Distortion and vignetting Distortion is a slight, not perfectly uniform barrel type that corrects well with available software profiles. Light falloff is heavy at the widest apertures but becomes minor once stopped down, helped by a comparatively long back focus distance.

Aberrations Coma is significant in the corners at wide apertures, unsurprising for an all spherical design, and strong spherical aberration produces purple haloing around point sources at f/1.1. Lateral chromatic aberration is low, while longitudinal color fringing is about average for a lens this fast.

Collector and user notes A recurring caveat is pronounced focus shift at close to mid distances, which makes rangefinder focusing between roughly f/2 and f/2.8 unreliable; reviewers suggest using live view at wider apertures where possible. Despite mixed press, owners report it excels for centre-weighted portraiture and low-light shooting where its weaknesses matter least.

History

Development and Launch Cosina introduced the Nokton 50mm f/1.1 under the revived Voigtländer name as its first very fast rangefinder normal lens, positioned as an accessible counterpart to Leica's expensive 50mm f/1.0 Noctilux. It uses a conventional spherical formula of seven elements in six groups and was manufactured in Japan.

Production Evolution The lens was succeeded within Cosina's lineup by aspherical designs, an f/1.2 and later an f/1.0 Nokton, that adopted newer multi-blade diaphragms, closer focusing and floating elements. The original f/1.1 retains the older single-coated, all spherical approach and Cosina's traditional straight-bladed diaphragm construction.

Collector Notes The lens is straightforward to identify by its all-black barrel, 58 mm filter thread and engraved Nokton 50mm f/1.1 markings. The most important buying caution is its strong focus shift, which can frustrate rangefinder users; this is widely cited as the source of its uneven reputation. The original hood and caps are worth confirming, and a vented LH-7 hood was offered as an alternative. Buyers should note a documented discrepancy in published figures: independent reviews describe a 10-bladed diaphragm and a 1.0 m minimum focus distance for this model, whereas LeicaLensList records a 12-bladed diaphragm and a 0.7 m minimum focus distance; the verified specifications take precedence here.