The Sigma 100-400mm f/5-6.3 DG DN OS Contemporary Lens for Fujifilm X is a versatile ultra-telephoto zoom lens designed to deliver exceptional optical performance in a compact and lightweight form. Here are the key features and specifications of this lens:

Key Features

Versatile Focal Length: This lens covers a focal length equivalent to 150-600mm in 35mm format, making it suitable for a variety of photography styles, from wildlife to sports and landscape photography.

Optical Design: It incorporates 22 elements in 16 groups, including one F Low Dispersion (FLD) and four Special Low Dispersion (SLD) elements. These elements work together to minimize chromatic aberrations and color fringing, ensuring high clarity and color accuracy throughout the zoom range.

Image Stabilization: The lens features a four-stop effective Optical Image Stabilization (OS) system that helps reduce camera shake, allowing for sharper handheld shots even at slower shutter speeds.

Fast Autofocus: A sophisticated stepping motor provides quick and virtually silent autofocus, enhanced by an optimized AF algorithm for smooth focusing performance. It also includes a focus limiter switch for faster focusing in specific ranges.

Close Focusing Capability: The minimum focusing distance is 3.7 feet (1.1 meters) at 100mm and 5.2 feet (1.6 meters) at 400mm, achieving a maximum magnification ratio of 1:4.1, which is excellent for capturing detailed close-up shots.

Durable Construction: The lens features a robust brass bayonet mount that ensures precise mounting and durability, along with rubber sealing to protect against dust and splashes, making it suitable for various shooting conditions.

User-Friendly Design: It includes an integrated AFL button for customizable settings, a zoom lock switch to prevent accidental extension during transport, and compatibility with the optional TS-111 Tripod Socket for added stability when using tripods or monopods.