Voigtländer Nokton 40mm f/1.2

Voigtländer Nokton 40mm f/1.2 Aspherical

When Cosina introduced an f/1.2 lens at 40mm, it filled an unusual gap in the rangefinder catalogue: a focal length close to the theoretical "normal" of a 35mm frame, paired with a maximum aperture rarely seen at that length. The slightly-wider-than-standard angle of view gives a natural perspective, while the bright aperture pushes the lens toward the subject-isolation territory normally associated with a fast 50mm, the background blur being roughly comparable to a 50mm at around f/1.4 to f/1.5 [1][3]. Built by Cosina under the licensed Voigtländer name, it has been positioned as an affordable yet seriously fast standard prime for Leica M and other mirrorless systems [2].

The optical formula uses eight elements in six groups, with two double-sided aspherical elements (four aspherical surfaces) intended to control aberrations and keep the lens compact despite its speed [1][3]. The barrel is all metal with a scalloped focus ring and a clicked aperture ring, and reviewers consistently praise the handling as smooth, weighty and free of play [2][3]. The lens couples to the rangefinder and focuses down to about 0.7 m at the coupling, with closer focusing of roughly 0.5 m available when using live view or an electronic viewfinder, beyond the range of the M coupling arm [2][4]. On a Leica M the lens brings up the 50mm and 75mm framelines rather than a dedicated 40mm frame, so framing requires accounting for that mismatch [2].

The Nokton 40mm f/1.2 has been produced in several mount versions. The Leica M (VM) version arrived first, followed by dedicated Sony E, Nikon Z and Canon RF designs; the mirrorless versions are optically tuned for their respective sensor stacks, and the E, Z and RF lenses differ in dimensions, filter size, blade count and accessories from the M-mount lens [1][4]. The native mirrorless versions also add electronic contacts for EXIF data and focus aids, which the M-mount lens lacks [4]. A revised Type II VM version was later released, described by the maker and retailers as lighter, optimized for current Leica sensors, and fitted with a fully blacked-out filter ring to suppress reflections; published figures for the two M-mount generations differ in weight and other details, so buyers should confirm which version a listing refers to [2].

Optical qualities

Rendering The lens has a dual personality. Wide open it is centrally sharp and contrasty but shows a softer, lower-contrast, slightly classic draw, which several reviewers describe as dreamy or characterful, while stopping down to around f/4 and beyond yields crisp, high-contrast results [3][4]. It is frequently compared to fast classic lenses for the way it combines that character with modern coatings and contrast [3].

Sharpness Central resolution is strong from f/1.2, better than many older f/1.2 designs, and the image cleans up substantially by f/2; the frame becomes very sharp across most of the field by about f/4 to f/8, though the extreme corners lag at the widest settings [1][4].

Bokeh and transitions The out-of-focus rendering is generally smooth and well regarded, with relatively restrained outlining for an aspherical lens. Because of the aspherical surfaces there are some traces of onion-ring texture in specular highlights, and bokeh balls turn to cat's-eye shapes toward the edges wide open, becoming geometric as the diaphragm closes [1][2][4].

Distortion and vignetting Distortion is minimal in practice, while vignetting is heavy at f/1.2 and clears progressively, becoming easy to correct by the middle apertures [1][4].

Aberrations Axial chromatic aberration produces visible violet fringing wide open; it improves markedly by f/2 and is largely gone by f/2.8 to f/4. The lens also shows some focus shift and field curvature, so careful focusing, ideally at or near the taking aperture, gives the best results [1].

Flare resistance Flare is handled well for such a fast lens, with clean sunstars at smaller apertures and generally controlled veiling; what flare appears tends to be soft-edged rather than distracting [1][3].

History

Development and Launch Voigtländer is one of the oldest names in optics, founded in Vienna in 1756 and later central to early photographic lens design; since 1999 the brand has been licensed to the Japanese maker Cosina, which has produced Cosina Voigtländer lenses across Leica M, Sony E, Nikon Z, Fuji X and other mounts [4]. The Nokton 40mm f/1.2 Aspherical was launched in this modern Cosina era, with the Leica M-mount version among the first releases, and was promoted as the fastest 40mm lens offered for the M system [1][2].

Production Evolution The design has been adapted across mounts over time, with the original M-mount lens joined by sensor-optimized Sony E, Nikon Z and Canon RF versions, and later by a revised Type II M-mount lens described as lighter and re-optimized for current Leica digital bodies, with a blackened filter ring to reduce reflections [1][2][4]. Because published specifications vary between these generations and mounts, the exact figures for weight, filter size and aperture-blade count depend on the specific version [2][4].

Special editions No major factory special editions, military or commemorative variants of this lens are widely documented; the notable differences are between mount versions and the first and second VM generations rather than limited runs [2][4].

Collector Notes The most important identification points are version and mount. The M-mount lens is purely mechanical and rangefinder-coupled, whereas the Sony E, Nikon Z and Canon RF lenses carry electronic contacts and are not interchangeable [4]. Buyers should confirm whether a listing is the original VM lens or the later Type II, as the two differ in weight and finish details, and should verify that the supplied metal screw-in hood and caps are present, since the dedicated hood affects vignetting and the cap design is specific to the lens [2][3]. As a current production lens rather than a vintage item, haze and coating decay are not typical concerns, but checking for decentering and smooth, play-free focus is worthwhile on used copies [3].

Sources

• [1] Phillip Reeve (David Braddon-Mitchell). Voigtländer 40mm f1.2 Nokton Aspherical: An In Depth Review. https://phillipreeve.net/blog/voigtlander-40mm-f1-2-nokton-aspherical-rolling-review/
• [2] CameraQuest (Stephen Gandy). Voigtlander 40mm f/1.2 II VM Mount. https://shop.cameraquest.com/voigtlander-leica-mount-lenses/voigtlander-40mm-f/1.2-ii-vm-mount/
• [3] Leica Rumors / Ohm Image. Voigtlander Nokton 40mm f/1.2 Aspherical lens review. https://leicarumors.com/2018/01/21/voigtlander-nokton-40mm-f-1-2-aspherical-lens-review.aspx/
• [4] Casual Photophile (James Tocchio). Voigtlander Nokton 40mm F/1.2 Aspherical Lens Review – Nikon Z Mount. https://casualphotophile.com/2023/03/13/voigtlander-nokton-40mm-f-1-2-aspherical-lens-review-nikon-z-mount/