The Sony Vario-Tessar T* FE 16-35mm F4 ZA OSS is a full-frame ultra-wide zoom for Sony FE E-mount cameras featuring Zeiss Vario-Tessar optics, T* anti-reflective coating, Optical SteadyShot, and a constant F4 aperture with 13 elements in 10 groups. It delivers high contrast and excellent edge-to-edge sharpness for landscape and architectural photography. This lens is part of Sony's Zeiss-branded FE zoom lineup.