Sony 16-35mm Vario-Tessar T FE F4 ZA OSS E-Mount Lens (Renewed)

Unmatched ZEISS T* (T-star) coatingThe name ZEISS is synonymous with high quality optics unsurpassed in optical performance. Pioneering the lens coating process ZEISS developed the T*(T-Star) lens coat that virtully eliminate lens flare, internal reflection and light scattering to produce uniform edge-to-edge detailed images. T* symbol only appears on multi-element lenses in which the required performance has been achieved throughout the entire optical path, therefore guaranteeing the highest quality. Circular ApertureWhen changing your aperture to defocus the background, the light sources appear blurred. This 'bokeh' effect of the blurred background can be enhanced with circular aperture blades used in this lens.

Conventional aperture blades have flat sides creating unappealing polygonal shaped defocussed points of light. Circular aperture overcomes this problem through the use of curved blades that keeps the aperture almost perfectly circular from its wide-open setting to when it is closed. Smoother, more natural defocusing can be obtained as a result. Aspherical lens elementsAspherical lens design dramatically reduces spherical aberration while also reducing lens size and weight. Spherical aberration is a slight misalignment of the light rays projected on the image plane, caused by differences in refraction in conventional spherical lenses which degrade image quality in large-aperture lenses.

Specially shaped "aspherical" elements near the diaphragm restore alignment of light rays at the image plane, maintaining high sharpness and contrast even at maximum aperture and can also be used at other points in the optical path to reduce distortion. Well-designed aspherical elements often requires complex glass molding technology, but can reduce the total number of elements required, thus reducing overall size and weight.