The zeiss 21 100mm t29 39 lwz3 lightweight zoom lens with sony e mount is the perfect blend between weight size and optical performance with a focal length of 21 to 100mm and a variable aperture of t29 39 t the lens is suitable for a wide range of applications making it the ideal choice for professional filmmakers the lens is designed for super 35 sensor cameras and is equipped with cine style ergonomics and a rugged splash proof housing