Product Features Mount with dust- and splash-proof structure The mount features a special sealing to make the lens an excellent choice in a wide variety of conditions. Rounded diaphragm The 9-blade rounded diaphragm creates an attractive blur in the out-of-focus areas of the image. Designed to minimize flare and ghosting From an early stage in the lens design process, flare and ghosting have been measured to establish an optical design resistant to strong incident light sources such as backlighting. SIGMA’s Super Multi-Layer Coating reduces flare and ghosting to help photographers produce sharp and high contrast images even in backlit conditions. High-precision, rugged brass bayonet mount The brass mount combines high precision with rugged construction. Its treated surfaces and enhanced strength contribute to the exceptional durability of the lens. Compatible with Lens Aberration Correction Matching the optical characteristics of the lens, this function performs in-camera corrections of peripheral illumination, chromatic aberrations, distortion, and more, to further enhance image quality 1 YEAR WARRANTY  

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.

SIGMA USB DOCK UD-11 By connecting the lens to SIGMA USB DOCK (sold separately / for L-Mount only), which was newly developed exclusively for the use with mirrorless cameras, users can adjust the amount of focus movement when operating the focus ring on exclusive SIGMA Optimization Pro software, which allows users to adjust focus in their preferred timing in MF mode.   Dual action zoom The SIGMA 100-400mm F5-6.3 DG DN OS | Contemporary supports straight zoom, which allows photographers to zoom in and out by adjusting the hood, enabling intuitive and quick view angle adjustments. It features a “Dual action zoom” which supports both straight zoom and ring zoom.