Sony Vario-Tessar® T* FE 16-35 mm F4 ZA OSS(SEL1635Z) E-Mount Full-Frame, Wide-angle Zoom Lens

A constant f/4 aperture for consistent performance and illumination throughout the zoom range. Ensuring optimal image quality, the lens design incorporates five aspherical elements, including one Advanced Aspherical (AA), three extra-low dispersion elements, and the Zeiss anti-reflective coating