With the rise of mirrorless cameras, the need for compact, high-performance, and high-quality lenses has never been greater. SIGMA answers this demand with the "I" series of full-frame mirrorless exclusive lenses, including the 90mm F2.8 DG DN | Contemporary lens. Designed specifically for L-Mount and Sony E mount, the DG signifies full-frame sensor coverage, while DN denotes a mirrorless-exclusive design. The I Series lenses are a new breed of Premium, Compact Primes that combine stylish aesthetics with impressive specifications and superior optical performance. The 90mm F2.8 DG DN | Contemporary lens, with its versatile mid-telephoto focal length, is the longest I series lens to date. Despite its reach, it remains remarkably compact and lightweight, making it an ideal choice for everyday use. Leveraging the camera's optical correction functionality, a unique advantage of mirrorless systems, SIGMA's optical designers focused on correcting aberrations that can only be addressed by the optical design. This approach not only enhances rendering performance but also reduces the size and weight of the lens. With a minimum focusing distance of 50cm and a maximum magnification ratio of 1:5, the lens enables close-up macro-style photography. It accentuates the subject, allowing photographers to capture fine details or create more abstract compositions. The 90mm F2.8 DG DN | Contemporary lens shares the same 64mm maximum diameter and 55mm filter size as