The sony 24mm f2 distagon t za ssm lens is a bright very high quality wide angle prime lens by carl zeiss it features a large maximum aperture of f2 which in combination with the 9 blade circular aperture creates beautiful defocus effects smooth silent af operation is provided by the high torque ssm super sonic wave motor while the lens superior optical design with 2 aspheric elements 2 ed extra low dispersion glass elements and t coating on optical surfaces ensures higher light tra