Cosina has unveiled the Voigtlander Nokton 50mm f/1 aspherical lens for Sony E-mount. The lens design differs from Cosina’s full-frame 50mm f/1 for Nikon Z-mount and M-mount, although it is comparable to the Canon RF mount version revealed in February. While there are some slight changes, such as front filter size and overall lens design, each Voigtlander 50mm f/1 prime appears to be based on a similar basis.

The lens makes use of Cosina’s in-house ground aspherical (GA) glass, which the company claims allows them to simplify the lens structure of the optic while still assuring great performance despite the very fast aperture.

“By adopting an in-house produced GA lens, this ultra-large aperture standard lens achieves the brightest f/1 among Voigtlander’s full-frame interchangeable lenses, while also achieving a toned-down style,” according to the company. “When the aperture is wide open at f/1, the amount of bokeh is extremely large, making it possible to express the motif in focus in an impressive manner.”

Although it is a manual focus lens, the Voigtlander Nokton 50mm f/1 has electronic contacts that allow it to communicate with an attached Sony camera and convey EXIF data. It also includes a built-in distance encoder, which supports Sony’s five-axis in-body image stabilization and activates the digital zoom in the viewfinder when manually focusing, allowing photographers to nail focus.

The lens is made up of nine elements divided into seven groups, including the aforementioned GA element at the front and a separate aspherical element at the back of the optic. A 12-bladed diaphragm allows it to operate at apertures ranging from f/1 to f-16. As a manual lens, the aperture is adjusted by a de-clicked ring near the front of the optic. Cosina comments that the lens’s silent aperture ring makes it excellent for video shooting. The front filter measures 67mm and has a minimum focusing distance of 0.45 meters (17.72 inches), with a maximum magnification ratio of 1:6.9.

Here are some sample pictures: