A versatile wide-angle prime designed for M-mount rangefinder cameras, the black Distagon T* 18mm f/4 ZM Lens from ZEISS provides an immense 98° angle of view to suit photographing wide-open expanses or tight, narrow interior locations with dimensional fidelity. Employing a Distagon optical design, distortion is significantly reduced for a realistic portrayal of scenes and both brightness and sharpness are maintained from edge to edge and three anomalous partial dispersion glass elements are also used to help control chromatic aberrations and color fringing for improved clarity and color fidelity throughout the aperture range. A T* anti-reflective coating has been applied to individual lens elements to control flare and ghosting when working in strong lighting conditions for increased contrast and color neutrality. Additionally, the lens's manual focus design permits working with subjects as close as 1.6' away.