An exceptional blend of optical performance and compact design, the Sigma 100-400mm F5-6.3 DG DN OS Contemporary Lens is a versatile ultra-telephoto zoom lens, exclusively crafted for full-frame mirrorless cameras. This lens offers a unique combination of high-resolution, edge-to-edge image quality across its entire focal range, and a lightweight body, making it ideal for field photography and everyday snapshots.This lens boasts a state-of-the-art optical design technology, delivering image quality that rivals standard zoom lenses such as the Sigma 24-70mm F2.8 DG DN Art. The level of bokeh and compression effect, unique to an ultra-telephoto lens, provides a fresh perspective to ordinary everyday scenes.The Sigma 100-400mm F5-6.3 DG DN OS Contemporary Lens is the 5th DG DN lens from Sigma, featuring an exclusive new design for full-frame mirrorless cameras. The lens construction comprises 16 groups and 22 elements, with one FLD and four SLDs used for the effective correction of aberrations and distortions. This lens consistently achieves high levels of optical performance in any condition, at every focal length from wide to telephoto, and from close-up shots to telephoto photography.In addition to a high-speed and smooth autofocus enabled by the stepping motor optimized to the latest algorithm, this lens incorporates powerful image stabilization (OS) of four steps. When combined with a camera body with built-in image stabilization, the lens corrects f