Fujifilm 23mm F1.4 R is an Auto Focus (AF) Wideangle Prime lens with APS-C / DX max sensor coverage. When mounted on a APS-C / DX sensor camera, it will give you an FF equivalent focal range of 34.5mm. Providing a max aperture of f1.4 at 23mm, this lens is very fast.
Fujifilm 23mm F1.4 R is not a weather sealed lens, so you have to be extra careful against rain and dust.