The Tokina FíRIN 20mm f/2.0 FE AF is an autofocus super wide angle lens for full-frame Sony E-mount mirrorless cameras. Engineered for to provide sharp, crisp and contrasty images from wide open at f2.0 to closed down at f22. Optimized for Sony's full-frame sensors, the optical design adopts 2 aspherical elements and 3 lenses molded from Super-low Dispersion glass to significantly reduce any type of aberration including spherical aberration, distortion and chromatic aberration while assuring high resolution and stunning performance even at wide open apertures. The AF drive system employs a quick responsive and silent ring-shaped ultrasonic motor. Coupled with GMR sensors the AF system performs fast, accurate and quite focusing. The lens is fully compatible with Sony's fast Hybrid AF system. At all AF mode settings including DMF, FíRIN 20mm f/2.0 FE AF provides the same auto focus performance as with common E-mount AF lenses. Fine manual focus adjustment is also possible. The lens' microship transmits all necessary data to the camera to correct shading, distortion and lateral chromatic aberrations. The camera can also make optical corrections with this data as well.