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 introduces an ultra-wide-angle zoom lens that is perfect for the era of ultra-high resolution digital cameras. The SIGMA 12-24mm F4 DG HSM | Art offers an optimal package of centre-to-edge image quality, minimized distortion, and minimum focusing distance. To achieve these qualities without compromise, SIGMA has leveraged its lens design expertise and all of its leading-edge technologies. Advanced materials such as low-dispersion glass play a crucial role, while SIGMA’s advanced lens processing methods have made possible an aspherical lens of extremely large diameter.