In order to combine the superior performance of F1.4 extra large aperture and medium focal length, it adopts a very rare optical structure of 17 elements in 12 groups, including 3 FLD fluorite ultra-low dispersion lenses, 2 SLD ultra-low dispersion lenses and 1 aspherical lens. , eliminating axial chromatic aberration, delivering excellent ultra-high resolution and beautiful bokeh effect