Voigtlander Heliar-Hyper Wide Aspherical 10mm F/5.6 Aspherical Lens LEN1421

Leica M-Mount Lens Aperture Range: f/5.6 to f/22 Two Aspherical Elements Rectilinear, Non-Fisheye Design Optimized for Use with Digital Cameras Manual Focus Design Minimum Focusing Distance: 1.6' Built-In Lens Hood Rounded 10-Blade Diaphragm