1、Full Frame Lens: Bring full frame, 114 degree ultra wide Angle use experience. Maximum aperture is F4, minimum aperture is F22, gear aperture mechanism, effectively prevent miscontact 2、Aspherical Glass: The use of two aspherical glass (ASPH) effectively controls aberration, reduces the number of lenses, and provides better optical performance while reducing weight and volume 3、Low Reflection Multilayer Coating: 3 low dispersion glasses (ED) are used to effectively reduce the dispersion aberration. 2 aspherical glasses (ASPH) and 5 high refractive index glasses are used to control the distortion and ensure the high picture quality from center to edge 4、Circular Aperture Blades: 10 circular aperture blades are used, and the small aperture presents a gorgeous star shaped pattern of 10 needles. The front end of the lens adopts a non bulb lens design and can be installed with 77mm diameter circular filter 5、Compatible Models: Compatible for E mount for FX3 A7S A7S2 A7S3 A7M2 A7M3 A7M4 A1 A7 A9 A9II A7R A7R2 A7R3 A7R4 A7RIV A7C A6400 ZVE 10 and other cameras