A remarkable optical performance and a full range of functionalities in a compact body for exceptional lightweight shooting.Introducing a long-awaited ultra-telephoto zoom lens designed exclusively for full-frame mirrorless cameras.With the levels of optical performance and functionalities essential for full-fledged shooting packed into a lightweight and compact body, which is a key in field photography, the SIGMA 100-400mm F5-6.3 DG DN OS | Contemporary is an ultra-telephoto zoom lens that invites you to take it with you on casual outings. The state-of-art optical design technology ensures edge-to-edge high-resolution and high-contrast image quality throughout its entire focal range. This ne.w lens achieves high image quality which rivals that of standard zoom lenses such as the SIGMA 24-70mm F2.8 DG DN | Art, ensuring a perfect match with these lenses while shooting. The level of bokeh and compression effect only achieved by an ultra-telephoto lens provides a fresh perspective to ordinary everyday scenes. This combination of ultra-telephoto images with the excellent mobility of the SIGMA 100-400mm F5-6.3 DG DN OS | Contemporary will open up ne.w ways for you to enjoy ultra-telephoto photography, as well as its possibilities, from everyday snapshots to field photography and everything in between. Whether you are currently considering trying a telephoto lens or already are a telephoto lens connoisseur, the SIGMA 100-400mm F5-6.3 DG DN OS | Contemporary is a "light and enjoyable ultra-telephoto zoom lens" that will provide a great value and a variety of styles to your shooting experience.SIGMA's 5th DG DN lens with an exclusive ne.w design for full-frame mirrorless camerasWith the optics design specifically for a camera with a short flange back distance, the DG DN series of lenses achieves a supreme combination of optical performance and compactness that could not have been possible with lenses for single-lens reflex cameras. Thanks to the stepping motor system that is optimised for both phase detection AF and contrast AF, the SIGMA 100-400mm F5-6.3 DG DN OS | Contemporary makes shooting with the video or eye-tracking AF very smooth.SIGMA's 5th DG DN lens is a long-awaited ultra-telephoto zoom lens. This lens will expand the possibilities of mirrorless camera photography even further.Product names: Abbreviations DG and DN indicate that the lens is suitable for full-frame cameras and is designed exclusively for mirrorless (short flange back distance) cameras, respectively.Designed exclusively for full-size mirrorless lenses released in the past:Sigma 45mm F2.8 DG DN | ContemporarySigma 35mm F1.2 DG DN | ArtSigma 14-24mm F2.8 DG DN | ArtSigma 24-70mm F2.8 DG DN | ArtUncompromising image qualityThe lens construction of the SIGMA 100-400mm F5-6.3 DG DN OS | Contemporary comprises 16 groups and 22 elements, with one FLD and four SLDs used for the effective correction of aberrations and distortions. Built on the latest optical design technology and optimised for mirrorless systems, the ne.w lens ensures the same high-resolution image quality all the way to the edges. In addition, it constantly achieves high levels of optical performance and makes the most of its capabilities as a zoom lens in any condition, at every focal length from wide to telephoto, and from close-up shots to telephoto photography.Furthermore, when paired with SIGMA TELE CONVERTER TC-1411/TC-2011 (sold separately / for L-Mount only), which was ne.