This 35mm f/2 lens is designed for full-frame format Canon EF mount DSLRs, and can also be used with APS-C models where it will provide a 56mm equivalent focal length.Bright f/2 maximum aperture benefits working in varying lighting conditions and also offers increased control over depth of field.Distagon type optical design incorporates one anomalous partial dispersion element to reduce chromatic aberrations and distortions for a high degree of sharpness and clarity.Floating elements system maintains consistent performance when working with both close-up and distant subjects.Enhanced Zeiss T* anti-reflective coating controls ghosting and flare for high contrast, color-neutral imagery.Manual focus design is benefitted by laser-engraved focusing and depth of field scales, along with an IR position dot and hard stops at both infinity and minimum focusing positions.Weather-resistant construction includes internal seals to guard against dust and moisture as well as a blue sealing ring at the lens mount to protect the lens-camera interface.