Optimized for wide-field shooting, the ZEISS Distagon T* 18mm f/3.5 ZE is an ultra-wide prime well-suited for interiors, architecture, and landscape subjects. The lens uses a Distagon optical concept, which helps to reduce field curvature and distortion for high overall sharpness and accurate rendering across the frame. Also, a T* anti-reflective coating has been applied to individual elements to control lens flare and ghosting.