Voigtländer Nokton 35mm f/1.2 I

Voigtländer Nokton 35mm f/1.2 I

When Cosina introduced this lens under the Voigtländer name in 2003, it was the fastest 35mm lens then offered for the Leica M mount, edging ahead of even the f/1.4 designs from Leica and Zeiss by half a stop [1]. The "I" refers to the original, larger version of the Nokton 35mm f/1.2, later distinguished from the more compact Version II that arrived in 2011. Its appeal rests on a combination that was unusual for an affordable rangefinder lens: a true f/1.2 maximum aperture, full rangefinder coupling, and an all-metal build, which let users shoot in very low light and isolate subjects with a thin depth of field on both film and the early digital M bodies [3].

The optical formula uses ten elements in seven groups with aspherical surfaces, a complex layout for a compact rangefinder lens. Construction is all metal, with a smooth, well-damped focus ring, etched markings, and a positive aperture click action, and the iris uses twelve blades. The lens accepts 52mm filters and couples to the rangefinder down to its 0.7 m minimum focus, the practical close limit of M-mount rangefinder coupling. Because the rear of the barrel protrudes, some users have noted that the lens can foul the electronics in certain mirrorless M-mount adapters, an issue worth checking before adapting it to other systems [2].

The original Version I is the larger of the two early variants, with a longer barrel than the Version II that replaced it; the later lens trimmed the size and gained a shorter scale-focus limit and easier six-bit coding while keeping the same ten-element formula and 52mm filter thread. The two versions also use different, non-interchangeable bayonet hoods. The Version I was offered in black and silver finishes. Cosina has indicated that the original was discontinued because the specialized glass became costly and difficult to manufacture, which has added to its standing among collectors as the more sought-after early variant.

Optical qualities

Rendering Reviewers describe the Version I as a strong performer wide open for its speed, with usable sharpness already at f/1.2 that improves markedly by f/2.8 and peaks around f/5.6 to f/8. Contrast wide open is moderate rather than high, and color files can look slightly flat compared with newer high-microcontrast lenses, a trait some find well suited to black-and-white work because it preserves shadow detail. The out-of-focus rendering is regarded as characterful, with brightly outlined specular highlights and a mild swirl rather than a perfectly smooth blur, and users report a delicate bokeh that holds up against more expensive rangefinder lenses. Mild chromatic aberration is visible at the widest apertures and largely clears by about f/1.8. These observations come from individual user reviews rather than standardized testing, so they should be read as consistent impressions rather than precise measurements.

History

Development and Launch Cosina built the Nokton 35mm f/1.2 to be the fastest 35mm lens available for the Leica M mount, a deliberate flagship for the revived Voigtländer rangefinder lens line. At launch no other production 35mm rangefinder lens offered an f/1.2 aperture, giving the Nokton roughly a half-stop advantage over the fastest competing designs.

Production Evolution The Version I remained in production until roughly 2009 to 2010, after which Cosina replaced it in 2011 with a redesigned Version II. The successor kept the same ten-element, seven-group formula and improved the glass for better optical performance while reducing the barrel size, lowering weight slightly, allowing scale focus closer than the rangefinder coupling limit, and making the lens easier to six-bit code for digital M cameras.

Collector Notes Because the Version I and Version II look similar in catalog images, buyers should confirm which variant they are handling: the Version I has the longer barrel and uses a hood that is not interchangeable with the later lens. Many copies are sold without the original dedicated hood, and owners commonly substitute a generic 52mm vented hood. As with any fast aspherical lens of this era, it is worth checking the glass for internal haze and the focus and aperture mechanisms for smooth operation, and confirming that the rear barrel clears any intended adapter.