With an F1.8 large aperture and exceptional image quality comparable to a prime lens across the entire zoom rangeThis zoom lens for Aps-c mirrorless cameras pushes the boundaries of still and video expressionThe Sigma 17-40mm F1.8 Dc | Art builds upon the groundbreaking innovations of the Sigma 18-35mm F1.8 Dc Hsm | Art, which earned high acclaim as the world's first F1.8 zoom lens in the photography and video industry. Thirteen years after its debut, this next-generation lens achieves not only superior optical performance but also a wider focal length of 17-40mm while reducing its weight by over 30%. This dramatically enhances the versatility of a large aperture standard zoom lens.In addition to the fast and quiet autofocus driven by the Hla (High-response Linear Actuator), the lens incorporates an inner zoom mechanism and minimal focus breathing, ensuring outstanding performance for both still photography and video production.