The name Fírin comes from the word Fírinne, which means "truth" in the old Irish language. It represents Tokina's promise to photographers to help them capture the truth in their images with this revolutionary lens.

The FíRIN 20mm F2 FE AF lens is an autofocus version of the existing FíRIN 20mm F2 FE MF ultra-wide lens, specifically designed for Sony E-mount cameras. It offers users more options according to their shooting purpose and style.

• Compact design: The FíRIN 20mm F2 FE AF is designed to perfectly match Sony E-mount cameras, offering exceptional optical results in a lightweight and compact construction.
• Optical performance: The lens is optimized for full-frame sensors and features 2 aspherical elements and 3 Super-low Dispersion glass lenses to reduce all types of distortion.
• Functionality: The FíRIN 20mm F2 FE AF offers autofocus with a fast and silent ultrasonic motor. It is fully compatible with the Fast Hybrid AF system, providing the same autofocus performance as common E-mount lenses.
• Correction of optical distortions: Shading, distortion, and chromatic aberration correction are performed by the camera using data from the lens chip.
• Image stabilization: The lens can fully utilize the camera's Body Image Stabilization.
• Aperture control: The camera system controls the lens aperture, providing full compatibility with all shooting modes.

The FíRIN series lenses have been developed and manufactured according to specifications licensed by Sony.