ZEISS T ANTI-REFLECTIVE COATING: The optical elements of ZEISS lenses feature T anti-reflective coating on all surfaces and an optical design that guarantees images of superior brilliance at all times, even in unfavorable lighting conditions. EXCELLENT RESOLUTION AND HIGH CONTRAST: ZEISS combines various specially developed technologies to reduce undesirable effects of stray light. The end results are richly saturated and vivid colors. ASPHERICAL DESIGN: The aspherical lens design ensures consistent imaging performance throughout the entire focusing range. It can reduce or eliminate spherical aberration and reduce other optical aberrations compared to a simple lens. SMOOTH AND RELIABLE AUTOFOCUS: The focusing system of ZEISS lenses is designed to ensure a robust and smooth-running autofocus mechanism with the best imaging performance. FLOATING ELEMENTS DESIGN: Thanks to the use of the latest floating element design principles, optical aberration effects in ZEISS lenses are reduced to a minimum throughout their entire focusing range.