"The FiRIN 20mm F2 FE MF is the premier lens in the newly established 'FiRIN' series of Tokina lenses specifically designed for mirrorless cameras (or ILCs - Interchangeable Lens Compacts). This lens marks the dawn of a new era for Tokina. The lens is a perfect match to the SONY A7 series camera bodies in terms of design, high-precision Japanese-made components and form factor. Super-wide 20mm lens for Full Frame SONY E mount cameras Extremely fast F/2.0 constant aperture 2 all glass precision molded Aspherical lens elements to for superior sharpness and contrast 3 Super-low Dispersion glass elements to control chromatic aberrations Aperture ring selector has 'Clicked' and 'De-clicked' settings for still photography and Cinema use Common 62mm filter thread of use with low-profile circular PLs and other filters Being compact and light-weight, the FiRIN 20mm F2 FE MF lens has exceptional optical performance due to its perfectly placed two all-glass precision molded aspherical elements included with 3 Super-Low Dispersion (SD) glass lens elements that greatly reduce aberrations and yield higher resolution and contrast. All the FiRIN lens elements are carefully multi-coated to reduce reflections and lens flare to absolute minimum. The FiRIN 20mm f2 FE MF has internal circuitry that gives it the ability to encode and transmit aperture, distance and optical data to camera body making this lens fully suitable for|Super-wide 20mm lens for Full Frame SONY E-mount cameras|Extremely fast F/2.0 maximum aperture|2 all-glass precision molded Aspherical lens elements for superior sharpness and contrast|3 Super-low Dispersion glass elements control chromatic aberrations|Aperture ring selector has ""Click"" and ""De-click"" settings for still photography and Cinema use.|62mm filter thread for use with low-profile circular PLs and other filters."