Zeiss 55mm f/1.4 Otus Distagon T Lens for Nikon F Mount Apochromat: Because this lens is an apochromat, chromatic aberrations (axial chromatic aberations) are corrected with elements of special glass with anomalous partial dispersion. The chromatic aberrations are therefore significantly below the defined limits. Bright-dark transitions in the image are reproduced almost free of color artifacts The ultimate in image contrast: Aberrations caused by extreme differences between shadows and highlights are particularly obvious in images captured at night. Thanks to the outstanding correction of lateral chromatic aberration, the floodlit facade is reproduced with absolute perfection. No colour fringing: Sources of light located in front of or behind the plane of focus present particular challenges to every lens. In the case of the ZEISS Otus, longitudinalchromatic aberration is so low that practically no colour fringing occurs. The medium format look: Thanks to its exceptional sharpness, the ZEISS Otus exploits the full potentialsof contemporary high-resolution sensors and rewards photographers with images characterised by breathtaking rendition of even the finest details. Aspherical design: The aspherical lens design ensures consistent imaging performance throughout theentire focusing range as well as sharpness to the periphery of the image. The asphere's more complex surface profile can reduce or eliminate spherical aberration and also reduce other optical aberrations compared to a simple lens.