NB: If extremely precise autofocus is required, the Sigma calibration dock will fine-tune the relationship between the specific camera and the specific Sigma lens you are using. For ultra precision, you may also want to hire the Datacolor SpyderLENSCAL calibration chart. Please see accessories below.
SIGMA’s First F1.2 maximum aperture, large-diameter prime lens
The "Art line in the age of mirrorless cameras" pursues ultimate performance as a large-diameter lens with a focal length of 35mm and also achieves a maximum aperture of F1.2. Three SLD glass elements and three aspherical lenses including a double-sided aspherical lens are optimally arranged in a construction of 17 elements in 12 groups. In addition to the optical design that makes use of the characteristic of the short flange focal length, it effectively takes advantage of the correction function inside the camera to correct distortion and peripheral illumination. Various aberrations that are difficult to correct in post-processing, such as sagittal coma flare, are thoroughly corrected by the combination of the optical design technologies that SIGMA has cultivated, achieving an overwhelming resolution that can resolve over 50 million pixels.
High operability that supports various shooting situations in both still and video
When using autofocus, comfortable shooting for a F1.2 large-diameter lens is achieved by the large Hyper Sonic Motor (HSM) that gets desired torque required to drive the focus lens group. When focusing manually, the focus ring driven by the focus-by-wire system, with the optimized torque setting responds to fine operations of the photographer. The aperture ring is also mounted with a de-click function for removing clicks, enabling seamless operations that are especially useful during video shooting.
Substantial functions enable user confidence, even in tough environments
The AFL button which can be assigned various functions and widens the range of operations available on the lens. Furthermore, the lens features a dust and splash-proof structure, along with a water and oil-repellent coating on the frontmost surface of the lens, which further supports shooting in various environments.