The 90mm f/2.8 Apo-Skopar from Voigtlander is a manual focus medium telephoto lens optimized for full-frame M-mount image sensors. The newly designed optical system uses Abnormal Partial Dispersion glass for five out of seven elements in seven groups to make images rich, three dimensional in character, and extremely sharp. It has an apochromatic design that makes axial chromatic aberration as close to zero as possible. The manual focus lens is designed for use with rangefinder-linked digital and film cameras and has a precision helicoid for smooth precise focusing action. The shortest shooting distance linked to the rangefinder is 3' (depending on the camera used).