Voigtlander's modern Cosina-made ultra-wide — the Super-Wide-Heliar 15mm f/4.5 in Leica Thread Mount.
The Super-Wide-Heliar 15mm f/4.5 is a modern Cosina-made Voigtlander lens, launched in 1999 as part of the Bessa system that revived the Voigtlander name on screw-mount rangefinder gear. It is not a vintage optic but a contemporary manual-focus design in Leica Thread Mount, aimed at photographers wanting an ultra-wide view on 39mm-thread bodies.
It is a manual-focus, rangefinder-mount lens with a 15mm focal length and a maximum aperture of f/4.5, giving roughly a 110-degree angle of view on full-frame. As an ultra-wide it is not rangefinder-coupled for focus in the usual sense; depth of field at this focal length is very deep, so scale focusing is the normal working method.
At 15mm the lens takes in sweeping interiors, tight streets and expansive landscapes with very deep depth of field, so most subjects from a metre or so to infinity stay acceptably sharp. Stopping down a little improves edge definition, and the compact barrel makes it easy to keep on a small body for travel and architectural work.
Because this is a newer Cosina-Voigtlander lens rather than a decades-old optic, used copies tend to be clean and mechanically sound; availability is reasonable and the main checks are smooth focus feel, clean glass and an aperture that clicks positively. It adapts readily to Leica M bodies with an LTM-to-M ring and to mirrorless cameras via inexpensive adapters, though on-sensor colour cast can appear at the extreme corners.