Voigtländer Color-Skopar 21mm f/3.5 I

Voigtländer Color-Skopar 21mm f/3.5 I

Cosina built this 21mm to sit in its retro-styled "Vintage Line" for Leica M rangefinder cameras, pairing 1950s-inspired exterior design with a modern aspherical optical layout [1]. It is the slower, more compact alternative to the company's faster 21mm wide angles, and it replaced the older 21mm f/4 Color-Skopar designs in the slow-21mm slot. Where the earlier 21mm f/4 lenses used an eight-element, six-group formula, this f/3.5 version steps up to a nine-element, eight-group construction, with the slightly larger maximum aperture coming alongside a modest increase in weight and complexity [2].

The lens is a fully manual, all-metal barrel design with a retro focusing knob and a clicked aperture ring, and reviewers consistently describe the build and finish as feeling more expensive than the price suggests[3]. The aperture runs on ten straight blades, the filter thread is the common 39mm size, and an optional LH-11 bayonet hood is offered. It is rangefinder coupled, with coupling reported from infinity down to roughly 0.7 m depending on the camera body, while the focusing helicoid itself continues to a 0.5 m minimum focus distance. The compact dimensions are partly a consequence of the relatively slow f/3.5 aperture, and the lens adapts readily to mirrorless bodies with an M adapter.

For identification, the lens carries the "Aspherical" designation in Cosina's marketing and on the barrel, and it is the M-mount member of the Vintage Line that shares its casing style with later additions such as the 28mm f/2 and 35mm f/2 Ultron variants. The "Vintage" label refers only to the exterior styling and not to the optical design, a point that has caused some confusion among buyers.

Optical qualities

Rendering Reviews describe a lens that is strong in the center and midframe across the aperture range, with corners that hold up less well and can lack a little contrast wide open. The optical character is otherwise modern and clean rather than overtly vintage.

Sharpness Center and midframe sharpness is rated as very good at all apertures on both Leica M and high-resolution Sony sensors, while the extreme corners trail behind. Field curvature is noted as a weakness at closer focusing distances.

Flare resistance Flare control is regarded as a strength; one tester found it genuinely difficult to provoke ghosting and had to push hard to generate any visible artifacts.

Distortion and vignetting The lens shows noticeable barrel distortion, which is straightforward to correct in software. Vignetting is heavy wide open, measured at about 2.4 EV, and improves only modestly on stopping down, behavior typical of small wide-angle rangefinder lenses. A correction profile is available for software-based fixes.

Collector and user notes Sunstars are well defined from around f/8 to f/11 thanks to the ten straight aperture blades, while the combination of a 21mm focal length, f/3.5 aperture, and 0.5 m minimum focus means there is little scope for shallow depth of field or background blur.

History

Development and Launch The lens is a current-production Cosina design sold under the Voigtländer name as part of the Vintage Line for Leica M mount, with the series positioned as classic-looking glass with up-to-date aspherical performance. Cosina marketed it as offering improved results on full-frame digital sensors compared with the older 21mm f/4.

Production Evolution Within Cosina's slower 21mm family, the lineage runs from the original 21mm f/4 Color-Skopar in screw mount, through the VM 21mm f/4 P in M mount using the same eight-element, six-group formula, to this f/3.5 version with its revised nine-element, eight-group design and increased weight. The same optical formula was also offered in a Sony E-mount version, and at least one reviewer compared the two mounts to check for optical differences.

Special editions No major factory special editions of this lens are widely documented; it is offered in a single black finish within the Vintage Line.

Collector Notes Buyers should note that the "Vintage" name refers only to the styling and not the optics, and that an optically similar E-mount variant exists, so confirming the M-mount, rangefinder-coupled version is worthwhile. The LH-11 bayonet hood and the 39mm filter thread are the relevant accessories to verify when purchasing.