The Milvus 21mm f/2.8 ZE, a wide-angle lens for Canon EF-mount cameras, has an advanced optical design that reduces distortion and creates crisp, clear images with dynamic perspective. Five anomalous partial dispersion elements are used to control chromatic aberrations for improved clarity and color accuracy, and a Distagon concept and floating elements system are used for consistent performance across the focusing range. Working in challenging lighting conditions is made easier with the application of an improved ZEISS T* anti-reflective coating, which reduces flare and ghosting. Important Features Full-Frame/EF-Mount Lens Format Range of Apertures: f/2.8 to f/22 Five Elements of Low Dispersion Design of Distagon Optical