Blending an impressive wide field of view with a rectilinear optical design, the Ultra Wide-Heliar 12mm f/5.6 Aspherical III Lens from Voigtlander is designed for 35mm film and full-frame digital M-mount cameras, and features an updated Heliar design to limit distortion and maintain consistent sharpness and illumination to suit mirrorless camera designs. One aspherical element is employed in the 12 elements, 10 groups optical design to control spherical aberrations and distortions throughout the aperture range. The lens also uses a manual focus design to permit fine-tuned control over focus placement, with a minimum focusing distance of 1.6', and a built-in petal-style lens hood is also featured to reduce flare and ghosting, as well as protect the front lens element.

Voigtlander BA335A