The 90mm F2.8 Dg Dn Contemporary Lens for Leica L is a testament to the evolution of mirrorless camera technology, striking a perfect balance between high performance and compact size. This lens is part of Sigma's ""I"" series, a collection of full-frame mirrorless exclusive lenses designed to meet the growing demand for compact, high-quality lenses with superior performance. This lens is compatible with both L-Mount and Sony E mount systems, with the Dg denoting full-frame sensor coverage and Dn signifying a mirrorless-exclusive design. The 90mm F2.8 Dg Dn | Contemporary lens stands out with its versatile mid-telephoto focal length, making it the longest lens in the I series. Despite its length, it maintains a compact and lightweight design, making it an ideal choice for everyday use. One of the key features of this lens is its ability to utilize the camera's optical correction functionality, a unique advantage of mirrorless systems. This allows Sigma's optical designers to focus on correcting aberrations that can only be addressed through optical design, thereby enhancing rendering performance while simultaneously reducing the lens's size and weight. The lens boasts a minimum focusing distance of 50cm and a maximum magnification ratio of 1:5, enabling close-up, macro-style photography. This feature allows photographers to capture fine details or create abstract compositions with ease. The 90mm F2.8 Dg Dn | Contemporary lens shares the same 64mm maximum diameter and 55mm filter size as the 24mm F3.5 Dg Dn | Contemporary and the 45mm F2.8 Dg Dn | Contemporary. This uniformity makes these lenses a natural trio, particularly for filmmakers who frequently use filters. All I Series lenses, including this one, feature an all-metal body with high-precision metal internal parts and a metal hood for durability. They also come with a manual aperture ring and knurled surfaces, providing a tactile experience that photographers will appreciate. An optional magnetic cap holder (Ch-11) with a mini-carabiner is available for easy attachment to a camera bag, jacket, or belt loop. The holder's donut-style center hole makes it easy to remove and replace the cap when necessary..