The Zeiss Milvus 21mm f/2.8 ZE Lens offers an in-depth look into your photography technique. It is compatible with Canon EF-mount cameras. Its optical design involves 16 elements in 13 groups, and of these, 4 are anomalous partial-dispersion elements that ensure clarity and edge-to-edge sharpness. The Zeiss T* anti-reflective coating on each element reduces ghosting and lens flare. This lens has a laser-engraved focusing and DOF scales with IR dot marks and hard stops. The frosted and anodized metal barrel surface offers a tactile feel in almost any weather condition. Moreover, the all-weather sealing prevents moisture from seeping into the lens.