This is a Zeiss-made lens that comes with auto focus to help you take that perfect picture. The aperture of the lens is maximum ƒ/2.8 and minimum ƒ/22.
From Photospecialist
Carl Zeiss Touit 12mm F2.8 X-Mount
Clifton Cameras
Zeiss Touit F2.8 12mm X-Mount - Fuji